Care Requirements
Adult Size
11.8" (30cm)
Min Tank
40 gal
Temperature
72-82°F
pH Range
6.5-7.5
Lifespan
8-15 years
Min Group
Can be kept alone
Diet
Carnivore
Swim Level
Bottom
Bioload
2/10
Hardness
5-15 dGH
About Peacock Eel
The Peacock Eel offers the spiny eel experience at a more manageable scale — reaching about 12 inches compared to the Fire Eel's 3+ feet. Named for the distinctive eyespot patterns along their dorsal region (resembling peacock feather markings), they're attractive, interesting fish that don't require the massive tanks their larger cousins demand.
Like all spiny eels, Peacock Eels are burrowers requiring sand substrate. They spend most of their time partially buried with just their pointed snout visible — this is normal, healthy behavior, not hiding from problems. Without appropriate substrate, they cannot exhibit natural behavior and become stressed.
They're genuinely peaceful fish that won't bother tankmates too large to eat. Unlike some oddballs kept primarily for impressiveness, Peacock Eels can be integrated into larger community tanks with appropriate companions. Their nocturnal nature means they're most active when the lights go out, but established specimens often emerge during feeding regardless of lighting.
Feeding can be challenging initially — many specimens refuse prepared foods and require live or frozen offerings. However, they're considerably easier to establish than Fire Eels. With patience, most accept frozen bloodworms readily and may eventually take pellets. Their smaller size also means less food is required, making ongoing care more economical.
Natural Habitat & Origin
Peacock Eels inhabit freshwater rivers, streams, and associated habitats across Southeast Asia — Thailand, Cambodia, Vietnam, and Malaysia. They prefer areas with soft, sandy substrate where they can burrow and hunt for benthic invertebrates.
Their natural habitat features slow to moderate water flow, abundant hiding spots, and soft bottom substrate. They occupy the same ecological niche as other spiny eels — nocturnal burrowing predators that hunt small invertebrates and fish.
Wild diet consists primarily of worms, insect larvae, small crustaceans, and small fish. They locate food using their sensitive, elongated snout to probe substrate.
Water conditions in their native range are typically soft and slightly acidic to neutral, with warm tropical temperatures year-round.
Native Region
Southeast Asia — Thailand, Cambodia, Vietnam, Malaysia
Habitat Type
Rivers and streams with sandy substrate
Wild Water Conditions
Warm (24-28°C), soft, slightly acidic to neutral
Appearance & Varieties
Peacock Eels display the characteristic spiny eel body plan — elongated and laterally compressed, with a pointed snout and continuous dorsal fin featuring the small spines that name the family. Their most distinctive feature is the series of 3-6 ocelli (eyespots) along the dorsal region, each resembling a peacock feather marking.
Base coloration is tan, brown, or olive with the darker eyespot markings providing camouflage. A pale lateral stripe often runs the body length.
Adults reach approximately 12 inches (30 cm) — substantially smaller than Fire Eels and more comparable to common aquarium fish.
Sexing is difficult with no reliable external differences. Females may appear plumper when carrying eggs.
Popular Varieties
| Variety | Description | Rarity |
|---|---|---|
| Standard/Wild-Type | Tan-brown body with characteristic eyespots along dorsal region. No selectively bred variants exist. | Common |
Tank Setup & Requirements
Quick Requirements Summary
Tank Size
Minimum Tank Size
40 gallons
Recommended Tank Size
60 gallons
Peacock Eels require sand substrate, hiding spots, and secure lids — but their smaller adult size makes requirements more accessible than larger spiny eels.
Water Parameters
Temperature 22-28°C (72-82°F), pH 6.5-7.5, hardness 5-15 dGH. Soft to moderately hard, slightly acidic to neutral water. Good water quality is important; maintain regular water change schedules.
Substrate
SAND IS MANDATORY — same as all spiny eels. They spend most time buried or partially buried. Without sand, they cannot exhibit natural behavior and become stressed. Fine, soft sand allows safe burrowing. This is non-negotiable.
Plants & Decorations
Provide caves, PVC pipes, driftwood, and similar hiding spots as daytime refuges. Plants can coexist — robust plants like Java Fern and Anubias attached to hardscape survive best. Floating plants provide appreciated shade.
Filtration & Water Flow
Good filtration maintains water quality. Cover filter intakes with sponge prefilters — they can squeeze into surprisingly small spaces. Avoid very strong current; moderate flow suits them.
Lighting
As nocturnal fish, dim lighting encourages more visible activity. Moonlight/blue LED options allow nighttime observation when they're most active.
Diet & Feeding Guide
Diet Type
carnivore
Feeding Frequency
Every other day for adults, daily for juveniles
Portion Size
Small to moderate amounts. Target feed near hiding spots, especially after lights out.
Peacock Eels are carnivores requiring meaty foods. Feeding is easier than with larger spiny eels but may still require patience with new specimens.
Best Foods for Peacock Eel
- Frozen bloodworms — Usually the first food accepted. High acceptance rate makes this the go-to for establishing feeding.
- Live blackworms — Excellent for reluctant feeders. Worms burrowing in sand trigger natural hunting behavior.
- Frozen brine shrimp — Good variety food typically accepted.
- Tubifex worms — Live tubifex trigger strong feeding response. Good for establishing reluctant feeders.
- Small earthworm pieces — Chopped earthworms are nutritious and usually accepted.
- Frozen mysis shrimp — Good protein source usually accepted once feeding is established.
Foods to Avoid
- Flakes — Inappropriate — they're carnivores needing substantial meaty foods.
- Floating foods — Bottom dwellers that won't pursue surface food. All foods must sink.
Most specimens accept frozen bloodworms within 1-2 weeks. Target feed near hiding spots after lights out.
Behavior & Temperament
Peacock Eels are nocturnal burrowers spending most daylight hours partially or fully buried in sand. This is normal, healthy behavior. They emerge primarily at night to hunt and explore, though established specimens often appear during feeding time. They're genuinely peaceful toward tankmates too large to eat. The burrowing behavior is their signature — watching them disappear into sand using rapid undulating movements is fascinating. With time and consistent feeding schedules, they often become conditioned to emerge when their keeper approaches.
Tank Mates: Compatibility Guide
Compatible Tank Mates
Too large to eat, peaceful enough to coexist.
Peaceful bottom dwellers sharing substrate space without conflict.
Too large and fast for predation.
Active mid-water swimmers, too large and fast for predation.
Similar habits, similar size. May share hiding spots peacefully.
Tank Mates to Avoid
Small fish
Anything mouth-sized will eventually be eaten.
Dwarf shrimp
Natural prey — will be consumed.
Aggressive fish
Their peaceful, shy nature makes them vulnerable to harassment.
Fish that compete aggressively for food
Slow feeders that may miss meals if competition is intense.
Common Pairing Questions
Can Peacock Eels live with other spiny eels?
Yes, in larger tanks with adequate space and hiding spots for each individual.
Peacock Eel breeding in home aquariums is rare. They're egg scatterers showing minimal parental care. Breeding reportedly triggered by simulated rainy season conditions. Fry are tiny and challenging to raise.
Health Issues & Disease Prevention
Peacock Eels are moderately hardy when their specific needs are met. Most health issues relate to substrate problems, escape injuries, or feeding challenges.
Common Diseases
| Disease | Symptoms | Treatment |
|---|---|---|
| Skin damage (substrate-related) | Abrasions, wounds from burrowing in inappropriate substrate. | Provide proper sand substrate immediately. Treat wounds with antibacterial medication. |
| Ich | White spots on body. | Raise temperature. Salt treatment effective. |
| Starvation/feeding failure | Emaciation, visible spine, lethargy. | Offer live foods (blackworms, bloodworms). Target feed near hiding spots. |
| Escape injuries | Physical damage from leaving tank or getting stuck in equipment. | Return to water immediately. Prevent with secure lid and covered intakes. |
| Bacterial infections | Redness, ulcers, fin deterioration. | Improve water quality. Antibacterial medication. |
Signs of a Healthy Peacock Eel
- Buried in sand with snout visible
- Active emergence at feeding time
- Strong feeding response
- Good body condition
- Clear eyes
- Smooth intact skin
Prevention Tips
- Provide sand substrate — essential
- Secure all escape routes
- Cover filter intakes
- Feed appropriate sinking foods
- Maintain good water quality
Frequently Asked Questions
About 12 inches (30 cm) — substantially smaller than Fire Eels (40 inches). This manageable size is one of their main advantages, making them accessible to keepers without massive tanks. A 40+ gallon tank accommodates adults appropriately.
Yes — sand is essential, not optional. They're burrowers that spend most time partially buried. Without sand, they cannot exhibit natural behavior and become stressed. Fine, soft sand is required for all spiny eel species.
Better than most oddballs — they're genuinely peaceful toward tankmates too large to eat. They can integrate into community tanks with appropriate companions (no tiny fish or shrimp).
That's normal — they're nocturnal burrowers. Staying buried during the day with just their snout visible is healthy, natural behavior. They emerge primarily at night.
Size is the main difference: Peacock Eels reach 12 inches, Fire Eels reach 40+ inches. This dramatically affects tank requirements (40 vs 125+ gallons), cost, and accessibility.
Absolutely — like all spiny eels, they're notorious escape artists. Their flexible bodies squeeze through surprisingly small gaps. Every potential exit must be sealed.
Tips for Keeping Peacock Eel
Pro Tips
- ✓Peacock Eels are the 'beginner' spiny eel — if Fire Eels seem intimidating, start here.
- ✓Frozen bloodworms establish most specimens within 1-2 weeks.
- ✓Provide at least 2-3 inches of sand depth for full burial.
- ✓Consistent feeding times teach them when to emerge — they'll anticipate the routine.
Common Mistakes to Avoid
- ✗Using gravel instead of sand — stress, inability to burrow, potential skin damage.
- ✗Inadequate lid security — escaped eel found dead.
- ✗Expecting daytime activity — they're nocturnal, adjust expectations.
- ✗Keeping with tiny fish — missing tankmates become food.
- ✗Uncovered filter intakes — eel trapped in filter.
Sources
- FishBase — Accepted scientific name, maximum size and native range for Peacock Eel.
Related Species You Might Like
View All Fish →
Peacock Gudgeon
Tateurndina ocellicauda
Freshwater Flounder
Brachirus spp. / Trinectes maculatus
Australian Rainbowfish
Melanotaenia splendida
Blue Phantom Pleco
Hemiancistrus sp.
Boesemani Rainbowfish
Melanotaenia boesemani
Bristlenose Pleco
Ancistrus sp.
Celebes Rainbowfish
Marosatherina ladigesi
Congo Tetra
Phenacogrammus interruptus
Ready to Add Peacock Eel to Your Tank?
Use our free stocking calculator to check compatibility, bioload, and get personalized recommendations.