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Scientific name
Gymnothorax favagineus
Family
Moray (Muraenidae)
Adult size
60-72 inches (150-180 cm); commonly 36-48" in captivity
Min tank size
300 gallons
Temperature
74-82°F (23-28°C)
Salinity
1.024-1.026 SG
Temperament
Aggressive predator; territorial
Difficulty
Expert
Lifespan
20-30 years

About the Tessellated Moray

The tessellated moray (sometimes called honeycomb moray) is one of the largest morays kept in captivity — wild adults reach 6 feet and 60 lbs. The body shows a striking white-on-black hexagonal pattern that intensifies with age. Demands a massive system (300+ gallons), expert handling, and a 20-year commitment minimum. The bite force and reach of an adult specimen is hazardous to keepers; tong-feeding and never working in-tank with the eel present are non-negotiable rules.

Native range: Indo-Pacific (Red Sea to Polynesia). The tessellated moray is a member of the Moray (Muraenidae) 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: 300 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: Frozen silversides, krill, squid, chopped fish. 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: Adult large predators: large groupers, large triggers (well-matched aggression), shark species in massive systems..

Avoid: Anything under 8", another large moray, smaller predators that could be eaten..

Breeding

Not bred in captivity.

Common problems and solutions

Tank outgrowth (most common); keeper bite injuries; refusing prepared foods initially.

Keeper note: Adult specimens require 300-gallon FOWLR minimum, sand-bottom, large rock structures forming a single primary den. Never reach into the tank with the eel present. Tessellated morays learn keeper recognition and become aggressive at feeding time within months.

Frequently asked questions

How big do tessellated morays really get?

Wild specimens 6 feet and 60 lbs. Captive specimens typically reach 36-48" due to dietary and space constraints, but can hit 5+ feet in proper systems.

Can I keep a tessellated moray in a 150-gallon tank?

No — 300-gallon minimum. The species will outgrow anything smaller within 3-5 years and become impossible to home.

Are tessellated morays dangerous?

Yes — adult specimens have serious bite reach and force. Tong-feed only, never work in-tank with the eel present.

How long do tessellated morays live?

20-30 years. This is a lifelong commitment.

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