Birdsnest Coral

Identity and scope

Common Name: Birdsnest Coral

Scientific Name: Seriatopora hystrix (with other Seriatopora species also sold as Birdsnest)

Other Names: Bird's Nest Coral; Needle Coral; Pink Birdsnest; Green Birdsnest

Family: Pocilloporidae

Coral Type: Small-polyp stony coral (SPS)

Native Range: Tropical Indo-Pacific, including the Red Sea, Indian Ocean, Southeast Asia, Australia, and central and western Pacific

Overview

General Description: Birdsnest is a trade name for branching Seriatopora corals, with S. hystrix a common reference. ORA's Hyacinth cultivar has fragile pointed branches and rapid reported growth. Other species and cultured forms should not inherit that cultivar's care or growth claims without qualification.

Appearance: Colonies consist of many thin, tapered branches covered in tiny corallites and small polyps. Branch thickness and compactness vary with species, light, and water movement.

Color Variations: Common colors include pink, green, yellow, cream, purple, tan, and combinations with contrasting growth tips or polyps. Color may fade, brown, or bleach as light, nutrients, and stress change.

Growth Form: Dense branching or bushy colonies that resemble a bird's nest

Notable Characteristics: Branches are brittle and can break during handling. Dense interior growth can restrict water movement and light, creating shaded areas where detritus accumulates or tissue declines.

Natural Habitat

Native Distribution: Widely distributed throughout tropical Indo-Pacific reef regions

Natural Reef Habitat: Occurs on reef slopes, crests, lagoons, and other habitats ranging from exposed high-flow zones to more protected areas, depending on species and colony form

Depth: Shallow to deeper reef zones; exact depth range varies by Seriatopora species and locality

Natural Lighting: Exposure varies with identified species, locality, depth and water clarity. Natural-habitat descriptions are context, not a measured aquarium PAR prescription.

Natural Flow: Exposure varies by species, locality and reef position. A natural-flow description does not determine a universal aquarium pump setting.

Other Habitat Notes: The trade name Birdsnest may include S. hystrix, S. caliendrum, S. guttatus, and cultured forms. Branch thickness, polyp appearance, color, and preferred flow can differ.

NATURAL REPRODUCTION

Natural Reproductive Strategy: Field studies identify Seriatopora hystrix as a brooding coral: fertilization and early larval development occur within the parent, which releases planula larvae. This documented natural reproductive mode is distinct from fragmentation used for captive propagation. Birdsnest is also sold under other Seriatopora identities, so do not generalize this finding to every trade form.

Aquarium Placement

Recommended Placement: Start lower than the intended final location and move gradually toward middle or upper rockwork as measured PAR and colony response permit.

Space Requirements: Allow open space around and above the colony for branching growth, multidirectional flow, and future maintenance access.

Rock/Sand Placement: Secure the skeletal base to stable rockwork. Keep branches away from shifting sand and prevent debris from accumulating in the colony interior.

Attachment Method: Use reef-safe cyanoacrylate gel, epoxy putty, or both on exposed skeleton at the base; avoid covering living tissue with adhesive.

Orientation: Orient the frag upright or naturally angled so multiple flow paths reach both the exterior and interior branches.

Distance From Other Corals: Leave clearance beyond the fully expanded colony and any observed defensive reach, including after dark and down-current. Add room for growth and neighboring aggression; no fixed separation guarantees compatibility.

Other Placement Notes: Do not wedge delicate branches into rock crevices. Choose a location that allows the entire colony to be removed if tissue loss or pests require treatment.

Lighting

Lighting Requirement: Match the confirmed form and previous measured lighting. ORA's Hyacinth cultivar example does not establish the requirements of every Birdsnest.

PAR Range: ORA's Hyacinth Birdsnest S. hystrix has a medium-to-high light description, not a numerical PAR prescription for all Seriatopora. Measure the intended location, start from the seller's lighting history, and adjust gradually while observing tissue, color and growth.

Spectrum Considerations: Ask about the seller's previous spectrum, measured intensity and photoperiod. Use appropriate reef lighting and make gradual changes; blue appearance, fluorescence or a color setting alone does not verify sufficient or safe exposure.

Acclimation Requirements: Ask about previous measured PAR, spectrum and photoperiod. Change exposure gradually with an adjustable fixture, shading or position, observing tissue and colony response; no fixed acclimation deadline guarantees success.

Signs of Too Much Light: Paling, bleaching, contraction or tissue deterioration after increased exposure warrant a lighting review, but are not light-specific diagnoses. Check water conditions, flow, physical injury, pests and contact damage before making repeated changes.

Signs of Too Little Light: Reduced growth or altered color can prompt a review of measured exposure and shading, but also has other causes. Compare with the colony's previous conditions and check chemistry, nutrition, flow and tissue condition rather than increasing light from appearance alone.

Water Flow

Flow Requirement: ORA's moderate-to-strong flow description applies to its Hyacinth S. hystrix. Adjust broad flow to the whole colony, including its interior, as branch density changes.

Preferred Flow Pattern: Provide adjustable broad indirect movement that clears debris and reaches the whole colony without pinning, abrading or tearing tissue. Reassess as the colony grows; qualitative flow categories are not universal pump settings.

Signs of Excessive Flow: Direct mechanical bending, tissue abrasion or continuous pinning warrants less direct exposure. Retraction or tissue loss alone is nonspecific; assess measured conditions and other possible irritants.

Signs of Insufficient Flow: Persistent debris or retained mucus warrants a circulation review. Poor expansion, color change or tissue decline has other possible causes and does not by itself prove inadequate flow.

Water Parameters

Temperature: OATA's small-polyp stony coral aquarium guide gives 24-26 degrees C as broad aquarium context, not a verified temperature optimum or tolerance limit for the identified Birdsnest specimen. Maintain stable measured conditions, ask about the specimen's history and adjust gradually.

Salinity: OATA's marine-and-invertebrate aquarium example is 1.024-1.026 specific gravity: reef-system planning context, not a verified salinity optimum for the identified Birdsnest specimen. Match established conditions with a calibrated instrument and check its temperature basis; no fixed SG-to-ppt conversion is assumed.

pH: OATA's small-polyp stony coral aquarium guide lists pH 8.1-8.3 as broad aquarium context, not a verified specimen limit for the identified Birdsnest specimen. Its general marine setup sheet uses a different pH interval. Monitor pH with gas exchange and carbonate alkalinity; avoid abrupt corrections to force a number.

Alkalinity: OATA's small-polyp stony coral aquarium guide lists 8-12 dKH as broad aquarium context, not a required endpoint or dosing target for the identified Birdsnest specimen. Measure carbonate alkalinity, keep changes gradual and consider nutrient conditions and observed response. dKH is not pH or freshwater GH.

Calcium: OATA's small-polyp stony coral aquarium guide lists 380-450 ppm calcium as broad aquarium context, not proof of a specimen-specific optimum or dosing requirement for the identified Birdsnest specimen. Check actual system demand and measured trends before adjusting supplements.

Magnesium: OATA's small-polyp stony coral aquarium guide lists 1250-1350 ppm magnesium as broad aquarium context, not a verified specimen-specific optimum or automatic dosing instruction for the identified Birdsnest specimen. Measure system conditions and verify any need before gradual adjustment.

Nitrate: Track nitrate with a reliable test alongside feeding, filtration and coral response. Avoid uncontrolled accumulation or abrupt nutrient stripping; no common optimal interval or diagnosis from one reading is established for every specimen in this guide.

Phosphate: Track phosphate, food input, algae and specimen response together. Avoid uncontrolled accumulation and abrupt stripping; a single low or high reading does not establish the cause of tissue loss, and no universal specimen-wide interval is prescribed.

Other Relevant Parameters: Use appropriate marine source water and routine system monitoring. Investigate ammonia or other abnormal readings rather than assuming a trace-element deficiency. Supplement only for a verified system need with suitable testing and product instructions; freshwater GH targets are inapplicable.

Parameter Sensitivity: Assess the actual specimen and measured system trends rather than assuming uniform tolerance. Avoid abrupt changes and review recent dosing, feeding, temperature, lighting, flow and handling when tissue or behavior changes.

Stability Requirements: Favor consistent measured marine conditions over repeated corrections. Verify surprising results, consider recent feeding, dosing and equipment changes, and adjust deliberately rather than changing chemistry, light and flow together.

Feeding & Nutrition

Photosynthetic: Yes; it relies heavily on photosynthetic zooxanthellae

Natural Feeding: Receives most energy from photosynthesis and also captures very fine zooplankton, suspended organic particles, and dissolved nutrients

Target Feeding: No genus-wide supplemental-feeding requirement or growth benefit is established by the ORA cultivar account. Ask about previous culture; if small broadcast feeding is tried, assess uptake and measured nutrient trends without coating the branches.

Recommended Foods: Rotifers, copepod-sized plankton, fine reef plankton preparations, and naturally available suspended particles

Feeding Frequency: No fixed schedule is established across the stated scope. If supplemental feeding is used, adjust small amounts to actual acceptance, uneaten food and measured nutrient trends; do not force-feed a stressed colony.

Benefits of Feeding: Grower observations can support optional feeding in their own stock, not a guaranteed improvement in growth, color or recovery for every specimen. Feeding does not substitute for appropriate lighting, measured water quality or health assessment.

Special Nutritional Requirements: Small polyps do not justify a universal food or dissolved-nutrient prescription. Avoid accumulating uneaten food between branches and base changes on observed response and measured system trends.

Growth

Growth Rate: Rapid growth is reported for ORA Hyacinth S. hystrix; actual growth depends on the identified form and aquarium conditions.

Growth Pattern: Thin branches form a bushy or nest-like colony. Branch form differs among Seriatopora; do not infer a precise flow setting from branch density alone.

Maximum Colony Size: No verified aquarium maximum is specified for the whole Seriatopora trade group. Reserve room for branch expansion and maintenance access rather than relying on a fixed diameter.

Space Requirements: Reserve room around the full branching footprint and maintain access for pruning and cleaning within the colony.

Overgrowth Concerns: Significant. Fast branch growth can shade lower corals, restrict its own interior flow, and become difficult to remove without breaking the colony.

Aggression

Aggression Level: Low direct aggression; moderate competitive growth

Sweeper Tentacles: Absent or very short; it does not use long sweeper tentacles

Chemical Warfare: A dissolved-compound interaction is possible in a mixed reef, but this review does not establish a predictable chemical effect for every specimen or a guaranteed filtration remedy. Examine physical contact, shading and water conditions before attributing decline to chemical warfare.

Stinging Ability: Prevent contact with neighbors and assess the actual defensive reach. No fixed sting-strength grade establishes safe proximity or guarantees tolerance between colonies.

Required Spacing: Use the actual expanded footprint, observed nighttime reach, current direction and future growth to set clearance. No fixed inch-based starting distance is verified as universally protective.

Corals to Avoid Nearby: Keep away from aggressive LPS corals with long sweepers and from slow-growing colonies likely to be shaded or crowded by the branches.

Compatibility

Fish Compatibility: Check the proposed fish's species-specific diet and behavior and observe the individual around this colony. A reef-safe sales label is not a guarantee; prevent persistent nipping, abrasion or physical displacement.

Invertebrate Compatibility: Assess the actual invertebrate's diet and behavior and secure the colony. Monitor food theft, irritation and displacement; a clean-up-crew or reef-safe label does not guarantee harmless contact.

Coral Compatibility: Mixed-reef suitability depends on the identified colonies' individual lighting, flow and growth needs plus separation from contact and defensive reach. Shared family or trade names do not establish safe touching or universal compatibility.

Potential Predators: Some butterflyfish, angelfish, filefish, parrotfish, and other coral-feeding species; individual behavior varies

Potential Irritants: Vermetid snail mucus, algae on exposed skeleton, sediment, shaded low-flow interiors, stinging neighbors, coral-eating fish, crabs, and repeated branch breakage

Fragging & Propagation

Difficulty: Form- and specimen-dependent. Routine propagation of a healthy established colony is separate from treatment of unexplained tissue loss.

Propagation Method: Growers report captive fragmentation, but the appropriate method depends on species, form and healthy tissue layout. Obtain experienced form-specific advice; this guide does not prescribe cutting ahead of tissue loss as a universal rescue.

Tools/Method: Plan routine propagation with an experienced coral propagator, suitable tools, personal protection and containment of mucus, dust and spray. No cutting, antiseptic or dip is automatically indicated for a damaged or declining colony.

Healing: Keep any legitimately propagated fragment under stable, appropriately acclimated conditions and monitor attachment and tissue margins. Healing time and success vary; deterioration needs assessment rather than automatic repeated dips or cuts.

Special Risks: Handling, heat, crushing and torn tissue can damage a colony. Shared equipment or moving fragments can transfer unwanted organisms. Do not move apparently healthy pieces from a declining colony into another system as an assumed cure.

Safety Considerations: Use gloves and eye protection, protect skin cuts, contain mucus and skeletal dust or spray, and clean tools between colonies. Avoid improvised cutting of a deteriorating specimen; obtain experienced propagation or coral-health guidance.

Health & Common Problems

Tissue Recession: Record where tissue is missing, how quickly it changes and whether skeleton is exposed. Environmental instability, mechanical injury, contact damage, pests and infectious processes are possible, not diagnoses from appearance. Check measured conditions and recent changes; continued loss warrants qualified assessment.

Bleaching: Paling or whitening with tissue still present differs from bare skeleton after tissue loss. Heat and light stress are possible contributors, but appearance alone does not identify the cause. Verify conditions and recent exposure changes, correct confirmed problems cautiously and seek advice if deterioration persists.

Polyp Retraction: Retraction or deflation alone does not establish a cause. Compare with the colony's usual behavior, handling and light cycle; check measured conditions, flow, sediment, pests, injury and neighbor contact. Persistent closure with tissue deterioration warrants qualified assessment rather than automatic treatment.

Pests: Inspect actual tissue, margins, base and sheltered surfaces for organisms and damage, and identify suspected pests before treatment. Quarantine or separation can assist observation where safe. A dip is product-, coral- and pest-specific, not a universal cure; follow the exact current label and do not assume eggs or hidden pests are eliminated.

Diseases: Rapid or slow tissue loss, melting, or brown jelly-like material are observations, not proof of bacterial disease. Multiple environmental, physical, pest-related or infectious causes are possible. Document progression, verify measured conditions and obtain prompt coral-health or aquatic-veterinary guidance. Use safe matched-condition separation when practical; antibiotics, cutting, tissue removal and dipping are not universal or appearance-triggered treatments.

Signs of Stress: Fading or browning, poor polyp extension, bleached tips, exposed white skeleton, tissue loss at the base or within branches, algae on dead areas, brittle growth, or stalled calcification

Common Keeper Mistakes: Allowing alkalinity to swing, increasing light too quickly, stripping nutrients to zero, providing narrow one-direction flow, ignoring shaded inner branches, and placing fragile colonies where fish or tools will strike them

Recovery Considerations: Verify measured water conditions and recent changes, assess lighting, flow, injury, pests and neighbor contact, and correct confirmed problems cautiously. Avoid repeated moves or simultaneous large changes. Continuing or rapid tissue loss warrants prompt qualified advice; no automatic fragging, cutting, dipping or antibiotic protocol is prescribed.

Beginner Suitability

Beginner Friendly: Conditional on suitable measured marine conditions, gradual acclimation, growth space, observation and the ability to obtain qualified help; no uniform beginner-success guarantee is made.

Why: ORA's cultivar example demonstrates captive growth, not genus-wide tolerance or superiority to Acropora. Prepare stable measured reef conditions, gradual lighting acclimation, branch-flow access and monitoring before purchase.

Major Challenges: Maintaining stable alkalinity, acclimating to bright light, preserving measurable nutrients, delivering flow through dense branches, and responding quickly to bleaching or tissue loss

Before You Buy

Important Considerations: Choose a frag with continuous tissue, intact branch tips, active polyp extension, and no algae-covered skeleton. Inspect the base and interior for tissue loss or pests. Ask about the seller's PAR, alkalinity, nutrients, and recent temperature stability.

Space: Reserve enough open volume for a dense branching colony and future maintenance access.

Lighting: Obtain measured PAR for the seller's particular Seriatopora form and ensure your lighting can be adjusted gradually; a medium-to-high category is not a measured target.

Flow: Provide broad, variable flow that will still reach the interior after the colony becomes dense.

Aggression: Its direct sting is limited, but nearby LPS sweepers can destroy branches and its own growth can shade slower colonies.

Parameter Stability: Prepare an established, stable marine system with reliable monitoring appropriate to the actual colony and its neighbors. No trade-name-wide chemistry or detectable-nutrient threshold is established by this guide.

Long-Term Growth: ORA's Hyacinth cultivar grows rapidly, but other forms vary. Review shading, branch crowding, access and flow as this particular colony expands.

Species-Specific Information

Anything important that does not fit above: Birdsnest Coral most commonly refers to Seriatopora hystrix, but other Seriatopora species and cultured varieties share the name. Branch density and flow requirements vary, so the whole colony must be observed rather than only the exposed tips. White tips can be new growth, while white skeleton spreading from the base or inner branches is a warning sign.

Related topics and compatibility

Similar Corals: Stylophora, Pocillopora, Montipora, Acropora, and other branching photosynthetic SPS corals

Compatible Corals: Compatibility must be assessed for the actual colonies, with individual conditions, growth space and separation from observed contact or defensive reach; this is not a blanket safe-neighbor list.

Related Guides: SPS Coral Care; Reef Aquarium Lighting; Stable Reef Alkalinity; Coral Acclimation; Coral Quarantine; Rapid Tissue Loss in SPS Corals