Not an eel at all but a fully aquatic, limbless amphibian (a caecilian) with a slick blue-black, rubbery body and tiny sensory tentacles near the mouth. It is a peaceful, nearly blind, mostly nocturnal aquarium animal that breathes air at the surface and bears live young.
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Medium: typically 16 to 22 in (40 to 55 cm) long, eel-like and limbless
Lifespan
5–15 years
Social needs
group
Native region
Northern South America (Colombia, Venezuela, the Orinoco and Magdalena drainages)
Origin
New World
Climate
🌴 Tropical
Water type
💧 Freshwater
Family
Typhlonectidae
Genus
Typhlonectes
Part of the Aquatic amphibians
Fully or largely aquatic amphibians kept in cycled, well-filtered freshwater aquariums. They surface to breathe, prefer gentle current and hiding spots, and are not handling animals.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Aquatic specialist tank
30 gal (36 × 12 × 16 in) for one adult
Typhlonectes natans is an aquatic limbless caecilian (legless amphibian). 30-gal tank with peat or soft sand substrate, gentle filter, dense plants and hides, LOW LIGHT (they're nearly blind and stress in bright light), 72–82 °F. Skin permeable — soft acidic water with no copper.
Photo coming soon
Recommended
Larger aquatic tank
55 gal (48 × 13 × 21 in)
Wider tank with soft acidic water, peat or sand substrate, dense plants, multiple hides, dim light. Caecilians are surprisingly active swimmers at night — provide enough water column. Co-house only with similar-size peaceful soft-water species.
Photo coming soon
Ideal
Planted blackwater tank
75 gal planted blackwater
Heavily planted blackwater tank with soft acidic water, peat substrate, leaf litter, dense plants, dim light, gentle filter. Specialist — caecilians are still poorly understood; record-keeping helps the hobby. Lifespan 5–10 years.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Amphibian eggs are soft, jelly-coated spheres laid in or near water — in floating clutches, strings, or foam nests depending on the species. The dark embryo is visible within the clear gel as it develops.
Photo coming soon
Tadpole / Larva
The aquatic larva (a tadpole in frogs/toads, a gilled larva in salamanders and newts) breathes through gills and feeds and grows in water. Frog/toad tadpoles are limbless at first, then sprout hind then front legs as metamorphosis nears.
Photo coming soon
Juvenile (froglet / eft)
At metamorphosis the animal develops legs and lungs and typically leaves the water as a froglet or, in many newts, a terrestrial eft. It resembles a small adult but is not yet sexually mature and its coloration may still be changing.
Adult
Adults reach full size and breeding condition, with the species' mature skin coloration and pattern. Many amphibians return to water to breed and can show seasonal or sex-specific changes such as nuptial coloration or crests.
Habitat & enclosure
Keep in a securely lidded freshwater aquarium of at least 20 to 30 gallons (75 to 115 L) for one or a few, with more volume for groups. Provide a sandy or smooth substrate, ample caves, PVC tubes, and dense planting so these burrow-loving animals can hide; they spook in bare tanks. Maintain water at 72 to 80 F (22 to 27 C), pH around 6.5 to 7.5, and soft to moderately hard water. They surface to gulp air, so leave a gap between water and lid and ensure the tank is escape-proof, as they are powerful and will find any opening.
Substrate
Use soft sand or smooth, rounded fine gravel that will not abrade their skin and allows burrowing. Provide plenty of cover with caves, tubes, driftwood, and plants. Avoid sharp or coarse substrate.
Equipment & setup
Run a reliable filter sized to the tank but baffle strong outflow, as they prefer gentle current. Use a heater with a guard to hold tropical temperatures, a tight, weighted lid to prevent escape, and dim or subdued lighting since they dislike bright light. A sponge or canister filter works well; ensure good biological filtration.
Diet
Carnivorous scavenger that hunts by smell and touch, not sight. Offer earthworms (a staple), bloodworms, blackworms, chopped fish or shrimp, and sinking carnivore pellets, fed in the evening near their hiding spots. Feed every 2 to 3 days. Because they feed slowly and are outcompeted by fast fish, target-feed near them or keep them with calm, slow tankmates.
Behavior & temperament
Peaceful, secretive, and largely nocturnal; spends the day buried or hidden and forages at night. Has poor eyesight and relies on chemosensory tentacles. Tolerates conspecifics and can be kept in groups. Not a handling animal: the skin is delicate and slimy, and handling stresses them; net or cup them rather than grasping. Generally safe with peaceful fish too large to be swallowed but may eat very small fish or shrimp.
Health
Sensitive to poor water quality, ammonia, and nitrite; stable, well-filtered, cycled water is essential. Bloating, skin cloudiness or fungus, refusal to feed, and constant surfacing can signal water or health problems. Avoid copper-based fish medications, which are dangerous to amphibians. Quarantine new arrivals. They give birth to live, free-swimming young.
Tips, DIY & hacks
Buy from reputable sellers, as many are wild-caught and may arrive thin or parasitized; quarantine and feed well to recover them. Feed in low light when they are active and target food near hiding spots. They are masters of escape, so secure every gap in the lid. Keep tankmates peaceful and not small enough to be eaten.
