Anubias Care Guide: Low-Light Aquarium Plant (Rhizome, Light, Propagation)

Anubias is a genus of slow-growing, rhizomatous aquarium plants in the family Araceae - the same aroid family as peace lilies and philodendrons. Unlike those houseplants, Anubias is grown almost exclusively in freshwater aquariums, where its leathery leaves, tolerance of low light, and refusal to be eaten by most fish made it a staple of low-tech planted tanks worldwide. This is an aquarium-only guide: if you are looking for a potted indoor houseplant, Anubias is the wrong search.

Almost every plant in the trade is a form of Anubias barteri or a closely related species sold under variety names such as nana, coffeefolia, and congensis. The single care mistake that kills more Anubias than any other is treating it like a rooted stem plant and burying the rhizome. Everything else - light level, algae management, melt after purchase - flows from understanding what Anubias evolved to do in West African rivers.

For related Anubias care, see Underwatering on Anubias, Spider Mites on Anubias, Mealybugs on Anubias.

What Anubias Is

Anubias is a semi-aquatic epiphyte: it anchors to rock and wood in flowing water, stores energy in a horizontal rhizome, and produces tough leaves that can last years underwater. Growth is deliberately slow - often one new leaf every two to four weeks on nana - which makes the plant forgiving of missed fertilizer but vulnerable to algae on leaves that never get replaced quickly.

The genus was first described in 1857 and revised in 1979; modern aquarium taxonomy still centers on Anubias barteri and its named varieties. The common name references Anubis, the Egyptian god of the afterlife, a nod to the shaded riverbanks where wild plants grow. That is not decorative trivia. Anubias wants shade, current, and a hard surface - not bright bare substrate.

A Semi-Aquatic Aroid From West and Central Africa

Wild Anubias is native to tropical central and western Africa, from Cameroon and Nigeria through Gabon and the Congo basin. Anubias barteri var. nana - the dwarf form most beginners buy - was collected in Cameroon and was first commercially cultivated by Tropica in 1970, which is why nana dominates shop tanks decades later.

Most nursery stock is grown emersed (in humid greenhouses above the waterline) because it is faster and cheaper. When you submerge that plant, old emersed leaves often melt while new aquatic leaves form - a normal transition covered in the first-8-weeks section below, not a sign the plant is dead.

Native Habitat and Why It Explains Every Care Rule

In habitat, Anubias grows as a rheophyte - a plant of fast-flowing forest streams and rapids. The rhizome grips stone or submerged wood with the stem exposed to oxygenated current; leaves may emerge above the waterline seasonally. That ecology maps directly to aquarium practice:

• Rhizome above substrate - burying the stem mimics anaerobic mud, not river rock.
• Low to medium light - forest canopy shade, not open tropical sun.
• Steady flow - detritus and algae spores cannot settle on static leaves.
• Hardscape attachment - the plant is an epiphyte, not a root feeder in soil.

When care advice conflicts online, return to this picture. Anubias punishes bright static water and buried crowns slowly but unmistakably.

Anubias Species and Varieties Worth Knowing

Trade names blur species and varieties, but size and placement are what matter at home.

Anubias barteri var. nana reaches roughly 5–10 cm tall with a creeping rhizome that can extend 10–15 cm or more (Tropica). It is the default for nano tanks, betta setups, and foreground hardscape.

Anubias barteri var. barteri and coffeefolia are midground plants with broader leaves; coffeefolia’s new growth emerges reddish-brown before maturing green. Anubias congensis and frazeri add height for background placement in larger tanks. A. gigantea and tall heterophylla forms suit show tanks and paludariums, not standard 20-gallon community layouts.

Tank Volume to Variety Quick-Picker

Pick the smallest variety that reads well at viewing distance. Oversized Anubias in a nano tank blocks flow and collects algae on leaves you cannot easily shade.

Aquarium Setup Scope: Submerged Tanks Only

Anubias can grow emersed in humid paludariums and Wabi-Kusa setups, but this guide targets fully submerged freshwater aquariums - community tanks, shrimp tanks, low-tech planted tanks, and cichlid setups with stable filtration. It does not cover terrestrial pot culture, outdoor pond wintering, or brackish water.

Before adding plants, cycle the tank or confirm ammonia and nitrite read zero. Anubias tolerates a wide chemistry band but not unstable toxic nitrogen. For parameter targets and water-change rhythm, see our Anubias watering and water-parameters guide.

Light: Low to Medium, With Shade as Insurance

Anubias survives deep shade and grows well at low to medium light - roughly 15–50 PAR at the leaf in modern LED terms, or about 0.25–0.5 W/L in older fluorescent references (Flowgrow). The risk is never too little light; it is too much intensity combined with long photoperiods on leaves that sit unchanged for months.

Because growth is rhizome-limited, doubling PAR rarely doubles leaf output. It does increase green spot algae and black beard algae on the next leaf that emerges. Run 6–8 hours of light in low-tech tanks; drop to 6 hours for two weeks if algae appears. Shade with driftwood, taller plants, or floating species such as Amazon frogbit.

Estimating PAR without a meter: If your stock LED on a standard-height tank feels uncomfortably bright to look at without sunglasses at tank level, Anubias probably wants shade, not more fertilizer. Dim the fixture to 40–60% or move the rhizome under a branch. A phone PAR app is approximate but useful for comparing spots in the same tank.

For photoperiod experiments, PAR at the rhizome, and algae-specific light fixes, use our dedicated Anubias light guide rather than duplicating tables here.

Water Parameters, Flow, and Stability

Anubias is forgiving on chemistry when conditions stay stable. Hobby references commonly cite:

Flowgrow lists pH 5–8 and optimum temperature 22–26°C across multiple Anubias species (Flowgrow - A. barteri var. barteri); the table above uses the tighter band most community tanks already sit in. Chasing perfect pH matters less than avoiding swings after large untested water changes.

Flow is not optional decoration. Wild plants live in current-rich forest rivers. Aim filter output so leaves flutter gently - enough to prevent detritus mats, not enough to tear tissue. Stagnant pockets around a buried crown invite rot and biofilm.

Rhizome Rule: Attach, Never Bury

Anubias is an epiphyte. The thick horizontal rhizome - the stem from which leaves and roots emerge - must stay exposed to oxygenated water. Tropica states plainly: if the rhizome is covered, it tends to rot.

A firm, green rhizome is healthy. A soft, mushy, foul-smelling rhizome is rotting. There is no partial credit.

If roots sit in substrate, rest the rhizome on top of the gravel line with roots trailing down - never bury the stem itself. Aquarium Co-Op’s rhizome-plant guide describes pulling the rhizome back to the surface after pressing roots in, which is the safest “planted” look.

How to Attach Anubias to Hardscape

Three methods work reliably:

1. Thread or fishing line - snug tie to driftwood or lava rock; roots grip in two to six weeks; thread can stay or be cut.
2. Cyanoacrylate gel glue - thin bead on rock, press rhizome 15–30 seconds; aquarium-safe when cured; avoid smothering the whole stem.
3. Wedge in rock crevice - natural for Seiryu or lava stone; easiest to reposition later.

Avoid non-aquarium silicone and hot glue. After trimming or gluing, give cyanoacrylate time to cure before adding sensitive invertebrates - some shrimp keepers notice stress during the first hours of cure in small volumes.

CO2 and Fertilizer: Optional, Not Required

Anubias does not require CO2 injection. A stocked community tank with regular water changes often supports slow growth indefinitely. CO2 at 20–30 ppm with higher light can thicken leaves and speed rhizome extension, but it also raises algae risk on slow leaves if the system is not balanced.

Dose a comprehensive liquid fertilizer weekly in low-tech tanks; half-strength is often enough. Root tabs near descending roots help in nutrient-rich substrate but are secondary to water-column feeding. Over-dosing unused macros feeds algae on persistent leaves more often than it rescues a pale Anubias.

For product timing and iron pale-leaf diagnostics, see our Anubias fertilizer guide.

Algae on Slow Leaves: Prevention and Fix Plan

The most common complaint is algae on Anubias leaves, not plant death. Slow growth means each leaf presents a stable surface for green spot algae (GSA) and black beard algae (BBA) for months.

Prevention: shade, 6–7 hour photoperiod, moderate phosphate, good flow, and algae grazers (Otocinclus, Amano shrimp, Nerite snails).

Active outbreak:

1. Cut photoperiod to 6 hours for two weeks.
2. Shade the rhizome under hardscape or floaters.
3. Manually remove algae with a soft brush; trim heavily coated leaves at the rhizome.
4. Spot-treat BBA with glutaraldehyde-based liquid carbon per label - use caution in shrimp tanks; many keepers half-dose or remove invertebrates during treatment.
5. Verify phosphate is not pinned near zero; GSA often tracks very low PO4 in high-light systems.

Liquid carbon is not a substitute for CO2; it is an algae tool with invertebrate sensitivity at full-tank dose.

Propagation by Rhizome Division

Propagation is rhizome division only - no tissue-culture kit required. Wait until the rhizome is at least 4–5 cm with five or more healthy leaves, then cut once with a sterilized blade so each section has at least three leaves and some roots. Ragged sawing invites rot.

Reattach sections to hardscape; expect 2–6 weeks before the first new leaf. Seed propagation is impractical for hobbyists: underwater flowers need hand pollination in humid emersed conditions and seedlings grow glacially.

Step-by-step division, timing, and mistakes are expanded in our Anubias propagation guide.

Common Problems: Melt, Yellow Leaves, and Rot

Most failures sort into three buckets: post-purchase melt, single yellow leaves, and rhizome rot.

Yellow Leaves vs. Emersed-to-Submersed Melt

One yellowing old leaf is normal nutrient recycling - trim at the rhizome when mostly yellow. A wave of yellow right after purchase is usually emersed-to-submersed melt: greenhouse leaves reabsorb while aquatic leaves form over 4–8 weeks. Firm rhizome + melt = wait.

Pale new leaves with green veins suggest iron uptake issues, often linked to high pH; a comprehensive fertilizer and stable 6.5–7.5 pH usually resolves it.

Rhizome rot is the emergency: goo at leaf bases, soft stem, cluster leaf drop. Causes include buried rhizome, shipping damage, and stagnant flow. Cut to firm green tissue, sterilize the blade between cuts, reattach to clean hardscape. Widespread mush rarely recovers - see root rot on Anubias for the full salvage path.

Tank Mates: Shrimp, Bettas, Cichlids, and Goldfish

Anubias suits shrimp tanks, betta resting-leaf setups, and cichlid or goldfish tanks where softer plants are shredded. Leaves contain insoluble calcium oxalate crystals common in Araceae - bitter enough that most grazers ignore them after one trial.

Amano and cherry shrimp graze biofilm; bettas use broad leaves as perches; African cichlids and goldfish usually leave tough Anubias alone when it is firmly glued to heavy rock.

Shrimp trimming myth: hobby reports of shrimp deaths after Anubias pruning exist, but a single proven toxin mechanism is not established. Deaths often coincide with medication dosing, ammonia spikes, or copper treatments. If you trim heavily, consider removing the plant briefly or ensuring the tank is not treating with copper-based ich meds - many invertebrates are copper-sensitive. When in doubt, trim outside the tank and rinse before return.

Anubias vs Java Fern and Bucephalandra

All three are slow rhizome epiphytes with the same “do not bury the crown” rule.

Anubias and Java fern are interchangeable workhorses for first planted tanks. Bucephalandra rewards experienced low-tech keepers who want smaller, pricier accents.

First 8 Weeks After Purchase

Use this checklist after mail-order or shop purchase:

Week 1: Float or attach without burying rhizome; confirm ammonia/nitrite zero; gentle flow on leaves; 6–8 hour light; optional 24–48 hour quarantine in a spare container if snails or pests are a concern.

Weeks 2–4: Expect melt on emersed leaves - trim yellow tissue at rhizome; do not fertilize heavily; verify rhizome firmness weekly.

Weeks 5–8: First new aquatic leaves appear smaller and thinner; increase fertilizer only if new growth stays pale; add algae grazers if speckling starts.

Ongoing: Photoperiod cap at 8 hours in bright tanks; divide rhizome only after obvious overgrowth; link long-term light tuning to the light guide.

If the rhizome stays firm through week 8, the plant has acclimated even if old leaves are gone.

Anubias Health Checklist

Before you change fertilizer, swap substrate, or buy a second plant, run this diagnostic - not a generic three-rule recap:

Anubias rewards patience more than intervention. A firm rhizome in shaded, flowing water outlasts most “rescue” doses. Attach correctly, light modestly, quarantine when pests matter, and let the plant replace its own leaves on a slow clock - that is the whole game.

When to use this page vs other Anubias guides

• Anubias overview - Canonical hub for this species - care topics and problems branch from here.
• Anubias problems - Symptom-first path when you already know something is wrong.

Related Anubias guides

• Anubias watering
• Anubias light
• Anubias soil
• Anubias propagation
• Anubias fertilizer
• Anubias repotting
• Anubias pruning
• Yellow Leaves on Anubias
• Slow Growth on Anubias
• Brown Tips on Anubias
• Root Rot on Anubias
• Overwatering on Anubias