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Scientific name
Heteroconger hassi
Family
Conger / Garden eel (Congridae)
Adult size
15-24 inches (40-60 cm)
Min tank size
90 gallons (10"+ sand bed mandatory)
Temperature
74-82°F (23-28°C)
Salinity
1.024-1.026 SG
Temperament
Extremely peaceful, social, colony-forming
Difficulty
Advanced (specialized substrate + feeding)
Lifespan
10-15 years

About the Spotted Garden Eel

Garden eels are the most specialized of the moray-style marine species — they live exclusively burrowed in deep sand beds, swaying in unison with currents, and feeding only on suspended particles drifting overhead. The spotted garden eel (Heteroconger hassi) is the most commonly available species. Building a successful garden eel display requires a 10"+ deep sand bed (mandatory), 5-7 specimens minimum (they require colony density), and very fine particle feeding twice daily. Stunning when set up correctly — but the requirements are uncompromising.

Native range: Indo-Pacific. The spotted garden eel is a member of the Conger / Garden eel (Congridae) 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: 90 gallons (10"+ sand bed mandatory) 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 brine shrimp, mysis, copepods, very fine particulate foods. 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: Peaceful upper-water species: chromis schools, smaller anthias, peaceful gobies, smaller wrasses..

Avoid: Anything that disturbs the sand or threatens the eels: triggers, large angels, eels of any other species, sand-sifters, larger predators..

Breeding

Not bred in captivity. Wild reproduction is poorly understood.

Common problems and solutions

Inadequate sand depth (most common); failure to feed (need fine suspended foods, not pellets); single-specimen mortality (require colonies of 5+ for survival); aggressive tank mates.

Keeper note: Sand depth is non-negotiable. The eels build burrows down to their full body length plus a few inches. Anything shallower and they cannot anchor properly, leading to chronic stress and death within 3-6 months. Sand grain size 1-2mm is ideal. Feed live or frozen baby brine shrimp twice daily, drifting it gently over the colony.

Frequently asked questions

How deep does the sand bed need to be for garden eels?

10 inches minimum. The eels burrow to their full body length plus a few inches. Shallower beds force constant exposure and chronic stress.

Can I keep a single garden eel?

No — they require colonies of 5+ specimens for survival. Solitary garden eels stop feeding and die within weeks.

What do garden eels eat?

Fine particulate suspended foods: live or frozen baby brine shrimp, copepods, very fine particle foods. They do not accept pellets or larger frozen items.

How many garden eels do I need?

Minimum 5 specimens, ideally 7-10. Colony density is essential for social behavior and feeding response.

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