Anacharis

Identity

Common Name: Anacharis

Scientific Name: Elodea densa (synonym: Egeria densa)

Other Names: Brazilian waterweed; dense waterweed; Brazilian elodea

Family: Hydrocharitaceae

Native Range: Native to parts of eastern Bolivia, southeastern and southern Brazil, northeastern Argentina and Uruguay, following Kew Plants of the World Online. Introduced distribution is not the same as native range.

Plant Type: Submerged freshwater stem plant; rooted or free-floating

Growth Form: Long, branching stems with dense whorls of narrow leaves

Overview

General Description: Anacharis is a submerged plant sold for freshwater aquarium planting or floating cover. This guide is limited to the densa species and does not establish that its daytime oxygen production replaces filtration, circulation or gas exchange.

Appearance: Bright to dark green stems carry narrow leaves in dense whorls, creating a bushy, bottle-brush appearance. Leaves are usually slightly toothed and curve away from the stem.

Growth Habit: Stems grow toward the surface, branch readily, and produce white roots from nodes. Floating stems spread horizontally before turning upward toward the light.

Notable Characteristics: This guide covers Elodea densa, widely sold as Egeria densa or anacharis. The trade name anacharis may also refer to other plants; this guide does not establish their care or legal status.

Best Uses: Background planting, floating cover, fry and shrimp shelter, breeding tanks, ponds, temporary nutrient export, and beginner aquariums

Natural Habitat

Native Distribution: Native to parts of eastern Bolivia, southeastern and southern Brazil, northeastern Argentina and Uruguay, following Kew Plants of the World Online. Introduced distribution is not the same as native range.

Natural Habitat: A submerged aquatic plant recorded in stationary or slowly flowing water, especially where the substrate has been disturbed.

Natural Water Conditions: Recorded in stationary or slowly flowing water; this habitat reference does not establish aquarium pH, hardness or nutrient targets.

Natural Substrate: PlantNET describes attached submerged growth, with roots at lower nodes and occurrence on disturbed substrates. It does not identify a preferred sediment mixture; floating aquarium cultivation is a practical option.

Other Habitat Notes: Fragments root and spread easily. Never release anacharis into drains, ponds, stormwater systems, or natural waterways.

Aquarium Placement

Foreground/Midground/Background/Floating: Best in the background or floating. Trimmed groups may fill the midground in larger tanks.

Space Requirements: Provide vertical room and open water around each group. Fast-growing stems can shade shorter plants and block the surface if not thinned.

Planting Method: Plant individual stems 1-2 in (2.5-5 cm) apart with the lowest bare node in substrate, secure gently with a plant weight, or float them. Do not bury leaves or crush the stem.

Attachment Requirements: None. It roots in substrate on its own and does not need attachment to hardscape.

Suitable Hardscape: It may be positioned behind rock or driftwood, but tight ties or glue can damage the stems.

Aquascaping Uses: Useful for creating a tall green backdrop, disguising equipment, softening hardscape, providing refuge, and quickly filling a new planted aquarium.

Other Placement Notes: Keep loose growth away from filter intakes and maintain open surface area for feeding and gas exchange.

Lighting

Light Requirement: Low to moderate

Recommended Intensity: Owner-reviewed starting PPFD: 20-50 micromoles of photons per square metre per second (at the occupied plant level). This is practical guidance, not a verified species requirement; measure the light reaching the plant and account for shading.

Photoperiod Considerations: Owner-reviewed starting schedule: 6-8 hours daily. Adjust after observing growth and aquarium conditions; this is not a universal species requirement.

Low-Light Suitability: Good. Growth may be slower, thinner, and more widely spaced under weak light.

Signs of Insufficient Light: Long gaps between leaf whorls, pale or small growth, thin stems, lower-leaf loss or leaning are observations to inspect, not proof of insufficient light. Review measured light, shading, handling history and aquarium conditions.

Signs of Excessive Light: Inspect bleaching and algae alongside measured light and aquarium conditions. Compact growth or appearance alone does not establish excessive light or rapid nutrient depletion.

Co2

CO2 Required: No

Benefits of CO2: Tropica rates its densa product as having low CO2 demand. The references reviewed here do not establish how injection changes branching, leaf density or color in an aquarium.

Growth Without CO2: It normally grows well without injected CO2, especially under low to moderate light with adequate nutrients and circulation.

CO2 Sensitivity: Shedding or stalled growth has not been established here as a specific response to CO2 change. Assess transport history, physical damage and aquarium conditions rather than attributing decline to a single cause.

Other CO2 Notes: CO2 injection is not prescribed here. As a practical maintenance recommendation, adjust trimming to observed growth rather than assuming injection creates a particular fertilizer demand.

Substrate & Nutrition

Root Feeder/Water Column Feeder: Rooted or floating cultivation is possible. Review the actual setup's nutrition as practical husbandry; the references reviewed here do not quantify root versus water-column uptake.

Preferred Substrate: Sand, fine gravel, aquasoil, or another planted substrate; none is required for floating stems.

Root Tabs: For rooted cultivation, assess measured conditions and the actual supplier's advice before considering root tabs. This guide does not establish their necessity, a safe dose or livestock compatibility.

Liquid Fertilizer: This guide does not prescribe fertilizer dosing or establish product safety for the livestock present. Obtain product-specific instructions and qualified advice before adding a treatment; do not infer a safe dose from leaf appearance.

Macro/Micronutrient Requirements: Nitrogen, phosphorus, potassium, iron and other essential nutrients support plant growth. Plant mass alone does not establish a deficiency; review measured aquarium conditions before considering supplementation.

Special Nutritional Requirements: No unusual requirement. Balanced nutrition is more useful than heavy dosing of a single nutrient.

Water Parameters

Temperature: Owner-reviewed practical starting range: 60-82°F (16-28°C). Not a species-wide tolerance limit; do not change livestock conditions solely to meet this plant range.

pH: Owner-reviewed practical starting range: 6.5-8.0. Not a species-wide tolerance limit; do not change livestock conditions solely to meet this plant range.

GH: Owner-reviewed practical starting range: 3-20 dGH. Not a species-wide tolerance limit; do not change livestock conditions solely to meet this plant range.

KH: Owner-reviewed practical starting range: 2-15 dKH. Not a species-wide tolerance limit; do not change livestock conditions solely to meet this plant range.

Parameter Sensitivity: Adaptable, but prolonged high temperatures may weaken growth, and sudden changes can cause leaf loss.

Stability Requirements: Stable temperature, light, nutrients, and CO2 are preferred. Acclimate new stems gradually when possible.

Growth & Maintenance

Growth Rate: Fast under favorable conditions

Maximum Height/Spread: Owner-reviewed aquarium planning estimate, not a verified species maximum: Individual stems commonly reach 24-72 in (approximately 60-180 cm); branching groups may spread widely at the surface.

Trimming Method: Owner-reviewed practical method; adjust to actual growth: Cut stems just above a node with clean scissors. Keep healthy tops, and leave rooted bases to branch or remove old bare sections.

Trimming Frequency: Owner-reviewed practical method; adjust to actual growth: Often every 1-3 weeks in well-lit, nutrient-rich tanks; less often in cooler or low-light systems

Replanting: Owner-reviewed practical method; adjust to actual growth: Replant healthy 4-8 in (10-20 cm) tops after removing leaves from the buried portion, or allow the cuttings to float.

Thinning: Remove crowded, shaded, or deteriorating stems from the base to improve light and circulation.

Special Maintenance: Siphon loose leaves, keep stems clear of intakes, and periodically replace old bare bases with healthy tops.

Propagation

Propagation Method: Stem cuttings, side shoots, and natural fragmentation

Difficulty: Very easy

Steps/Behavior: Owner-reviewed practical method; adjust to actual growth: Cut a healthy stem or side shoot with several nodes. Remove damaged lower leaves, then plant the bare lower node or float the cutting. Roots and new branches develop from nodes.

Special Requirements: Use healthy green cuttings, avoid crushing stems, and never dispose of living fragments in natural waterways.

Compatibility

Fish Compatibility: Assess each fish species' water requirements, feeding and foraging behaviour before selecting plants. Peaceful temperament alone does not establish compatibility. Preserve open feeding, swimming and surface-access areas.

Invertebrate Compatibility: Plant identity alone does not establish shrimp or snail safety. Ask the supplier about treatments and preparation before introduction; this guide provides no pesticide-clearance protocol or treatment-safety guarantee.

Fish That May Damage It: Goldfish, silver dollars, large cichlids, and other herbivorous or digging fish may eat, uproot, or break it.

Plant-Safe Herbivores: No animal is guaranteed plant-safe. Assess the actual species and individual, and inspect newly planted growth for grazing or physical disturbance.

Other Compatibility Notes: Anacharis is often used with goldfish but may be eaten. Treat it as possible enrichment rather than permanent aquascaping in those tanks.

Common Problems

Melting: Inspect leaves and lower stems after transport or changes in the aquarium; timing alone does not establish the cause of deterioration. Total softening, foul tissue or failure of new tips warrants prompt review rather than being dismissed as normal acclimation.

Yellowing: Yellowing does not identify a nutrient shortage or prove harmless aging. As a practical checklist, inspect shading, light, stem damage, handling history and measured aquarium conditions.

Holes/Damage: Inspect damaged leaves for visible grazing, handling damage, equipment contact and deteriorating tissue. Holes alone do not establish potassium shortage or a chemical treatment need.

Algae Susceptibility: Algae can occur on aquarium plants. This guide does not establish that growing this plant prevents algae or provides a reliable algae-control treatment. Inspect growth and tank conditions; do not substitute a plant for aquarium maintenance.

Nutrient Deficiencies: Pale, yellow or damaged growth is not a reliable diagnosis of a particular nutrient deficiency. Review plant identity, recent handling, light, physical damage and measured aquarium conditions before choosing an intervention; this guide supplies no corrective chemical dose.

Other Common Problems: Bare lower stems, floating cuttings, browning, leaf shedding, clogged intakes, surface overgrowth, and accidental hitchhikers

Likely Causes: Practical checks, not established causes: handling and treatment history, crowding, light, circulation, physical damage and measured aquarium conditions. Do not infer a safe chemical correction from appearance.

Solutions: Remove decaying tissue, retain healthy tips, stabilize conditions, provide moderate light and circulation, review nutrient needs without diagnosing from appearance alone, thin dense groups, and clean up loose leaves.

Beginner Suitability

Beginner Friendly: Yes

Why: It grows planted or floating, does not require injected CO2, tolerates broad conditions, and propagates easily from cuttings.

Common Beginner Mistakes: Planting store-bought stems as one tight bunch, burying leaves, allowing growth to block light or intakes, using excessive light, overfertilizing, and assuming all plants sold as anacharis are the same species

Before You Buy

Important Considerations: Confirm the scientific name before buying because anacharis can refer to Egeria or Elodea. Check current local sale, possession, transport and disposal rules for the exact species; this guide does not establish legal permission. Never release living fragments into waterways.

Expected Growth: Tropica describes fast stem growth for its densa product. Observe new tips and branching after planting, without assuming that leaf loss has a particular shipping, temperature or hardness cause.

Space Requirements: A small bunch can become a large background stand or floating mat. Plan for routine thinning and open swimming space.

Equipment Requirements: Standard aquarium lighting and filtration are sufficient. Fertilizer and root tabs may help; injected CO2 is optional. Scissors and a siphon simplify upkeep.

Maintenance Requirements: Low to moderate, mainly trimming, thinning, replanting, and removing loose leaves

Species-Specific Information

Anything important that does not fit above: Anacharis is an ambiguous trade name. This guide is limited to Elodea densa (synonym Egeria densa), not Elodea canadensis or every plant sold as anacharis. Confirm supplier identity and current local sale, possession, transport and disposal rules. Never release living fragments into waterways.