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Scientific name
Gymnothorax undulatus
Family
Moray (Muraenidae)
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
Aggressive predator
Difficulty
Advanced
Lifespan
15-20 years

About the Leopard Moray

The leopard moray (also called undulated moray) is a large Gymnothorax with bold leopard-spot patterning across a yellow-green body. One of the more aggressive medium-large morays, demanding careful tank-mate selection and a substantial 180+ gallon FOWLR system. Striking pattern and active feeding behavior make it a popular display species for keepers willing to handle the aggression.

Native range: Indo-Pacific. The leopard 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: 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: 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 reef predators: large angels, peaceful triggers, large tangs..

Avoid: Small fish, small inverts, conspecific morays in tanks under 240 gallons..

Breeding

Not bred in captivity.

Common problems and solutions

Aggression; bite injuries; tank outgrowth; cohabitation conflict.

Keeper note: High aggression compared to peaceful banana or whitemouth morays. Tong-feed only with bite awareness. Multiple cave structures required to reduce territorial pressure.

Frequently asked questions

How aggressive is the leopard moray?

High — among the more aggressive Gymnothorax species. Comparable to dragon moray in attitude.

How big does the leopard moray get?

36-48 inches at adult size. Plan for 180+ gallon FOWLR.

Is the leopard moray reef safe?

Coral-safe; fish-unsafe with small species.

Can I keep two leopard morays?

Generally no — territorial conflict in any system under 240 gallons. Confirmed breeding pairs in massive systems are the only exception.

Related species

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