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Scientific name
Myrichthys colubrinus
Family
Ophichthidae (Snake eels)
Adult size
36-48 inches (90-120 cm)
Min tank size
180 gallons
Temperature
74-82°F (23-28°C)
Salinity
1.024-1.026 SG
Temperament
Peaceful but predatory
Difficulty
Advanced
Lifespan
12-18 years

About the Snake Eel

The banded snake eel (Myrichthys colubrinus) mimics the highly venomous banded sea krait so successfully that most predators leave it alone — and many beginning aquarists are afraid to handle it. The eel itself is non-venomous. Black-and-white banded body, slim form, and largely nocturnal. Lives buried in sand with only head exposed during daylight. A unique display species for keepers who appreciate biological mimicry.

Native range: Indo-Pacific. The snake eel is a member of the Ophichthidae (Snake eels) family. Most specimens in the US trade are wild-caught from collection points in their native range and shipped through Indo-Pacific or Atlantic marine wholesalers. Wild-caught morays often arrive with internal parasites and shipping stress — a 4-week quarantine in a separate system with prazi and metronidazole prophylaxis is the standard reef-keeper protocol before display introduction.

Tank requirements and setup

Tank size: 180 gallons is the practical minimum for a single adult. Substrate should be marine sand 2-4 inches deep — fine grain to prevent abrasion. Hardscape should provide multiple cave structures, PVC pipe segments, and overhangs that allow the eel to choose its preferred resting position. Lighting can be standard reef LED; morays do not require special light spectrum. Filtration should be oversized — morays are messy eaters and produce significant nitrogenous waste. A skimmer rated for at least 1.5x the actual tank volume is the standard for moray-housing FOWLR systems.

The lid is non-negotiable. Morays are exceptionally strong jumpers and escape artists. A 1cm gap is enough for an adult specimen to find and exploit. Hood-style covers work; rimless tanks need custom acrylic or glass cut to seal completely.

Diet and feeding

Primary diet: Live + frozen small fish, shrimp, crab. Morays are obligate carnivores. Feed 2-3 times per week for adults, daily for juveniles. Use feeding tongs rather than dropping food — morays learn to associate tong tips with food and develop reliable feeding responses within 1-2 weeks. Variety matters: rotate between silversides, krill, squid, chopped scallop, and occasional whole shrimp for nutritional completeness. Avoid feeder goldfish — they carry thiaminase that destroys vitamin B1 and leads to long-term neurological problems.

Compatible tank mates

Safe: Large reef fish that ignore the burrowed eel; corals..

Avoid: Small fish (will be eaten), small shrimp + crabs (eaten), other eels in small systems..

Breeding

Not bred in captivity.

Common problems and solutions

Mimicry-driven keeper anxiety; jumping; eats cleanup crew shrimp and crabs.

Keeper note: Deep sand substrate (4-6") for burrowing. Snake eels are non-venomous but their mimicry is so good that even experienced aquarists hesitate. Reassure handlers with documentation. Tank lid mandatory.

Frequently asked questions

Is the snake eel actually venomous?

No — Myrichthys colubrinus is non-venomous. It mimics the highly venomous banded sea krait (Laticauda colubrina) to deter predators.

Is the snake eel reef safe?

Coral-safe; fish-unsafe with small species; cleanup-crew-unsafe with shrimp and crabs.

How aggressive is the snake eel?

Peaceful toward tank mates but predatory toward prey-size species. Not aggressive in defensive sense.

Why is it called a snake eel?

Body shape and banded coloration mimic the banded sea krait, a true snake. Different taxonomic order entirely (Ophichthidae vs Reptilia) but the mimicry is convincing enough that the common name stuck.

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