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The striped spiny eel — frequently sold under the trade name "peacock eel" — is identified by its row of distinctive eyespots along the dorsal fin (the "peacock feathers" that earned its common name). It is the species most aquarium hobbyists actually have when they buy a "peacock eel" at a chain store. Mid-size, peaceful in community contexts, and one of the most active spiny eels during evening hours under blue moonlight.
Native range: Southeast Asia (Thailand, Cambodia, Laos, Vietnam, Malaysia, Indonesia). The striped spiny eel is a member of the Spiny eel (Mastacembelidae) family and shares the characteristic elongated body plan, sand-burrowing behavior, and nocturnal hunting style that defines its relatives. Aquarium specimens enter the trade from a mix of wild-caught monsoon-season collection and limited captive breeding programs in source countries. Buyers should ask the vendor about source country and acclimation history before purchase — a quality vendor will know whether their specimen has been quarantined and trained to take prepared foods, which dramatically affects the success rate at home.
Tank size: 55 gallons is the practical minimum for a single adult specimen. Larger species and group-keeping require proportionally larger systems. Substrate is the single most important husbandry detail: fine pool-filter sand (1-3mm grain) is mandatory. Gravel and crushed coral abrade the slime coat and lead to skin lesions, secondary infection, and accelerated mortality. Build the substrate 2-4 inches deep so the eel can burrow with only its head exposed during daylight hours.
Hardscape: provide multiple cave structures — smooth river rock, PVC pipe segments (3-6" diameter), or commercial reef rock caves. One cave per eel plus 1-2 extras gives them the territorial flexibility to avoid stress. Lighting should be dim or have heavily-shaded zones; floating plants (water lettuce, Amazon frogbit, salvinia) work well to break up overhead light without compromising plant growth on rooted species below. Filtration: oversize by 2x — most spiny eels are messy eaters and produce significant nitrogenous waste. Canister filter sized for a tank twice the actual gallonage is the safe rule.
Lid: tight-fitting, gap-free, weighted if necessary. All freshwater eels are escape artists. A 1cm gap is enough for a 16" zigzag to find and exploit. Hood-style aquarium lids are usually adequate; rimless tanks need custom-cut acrylic or glass with no gaps around heaters, filter intakes, or air lines.
Primary diet: Carnivore - bloodworms, blackworms, mysis, krill, earthworms, sinking pellets. Striped Spiny Eels are obligate carnivores. Wild specimens eat insect larvae, small fish, crustaceans, and worms; captive diet should approximate this with high-protein meaty foods. Frozen bloodworms, blackworms, mysis shrimp, and chopped earthworm are the staple base. Sinking carnivore pellets (New Life Spectrum, Hikari Vibra Bites, Omega One) can be trained as a supplement once the specimen accepts prepared foods.
Feeding strategy: target-feed with tongs at lights-off or under blue moonlight. Most spiny eels are out-competed in busy community tanks during daytime feeding; delivering food directly to the eel's territory after dark ensures it actually eats. Frequency: 4-5 small meals per week for adults, daily for juveniles under 6". Skip feeding 1-2 days per week to mimic wild feast-famine cycles and prevent obesity in long-term captive specimens.
The first 2-4 weeks after introduction are the highest-risk period for refusing food. Start with live blackworms (irresistible to almost every spiny eel) and transition to frozen and prepared foods over 3-6 weeks once feeding response is established.
Safe: Mid-water peaceful community fish: rainbow fish (Boesemani, Turquoise), larger tetras (Congo, lemon), gouramis (not dwarf — they will compete poorly), corydoras catfish, bristlenose plecos, peaceful loaches..
Avoid: Very small fish (<1.5"), aggressive cichlids, fin-nipping species like tiger barbs in small groups..
The general rule across all spiny eels: any tank mate must be larger than the eel's mouth (or roughly 30% of the eel's body length) and tolerant of nocturnal disturbance. Stress-prone species like discus and slow-moving fish like angelfish often do poorly with active nocturnal eels even when size matches. Match temperament more than just size.
Egg scatterers; bred more often than other spiny eels by hobby breeders due to lower minimum size + tolerance of softer parameters. Cooling cycle + heavy live foods trigger spawning. Eggs adhere to plants; fry need infusoria then BBS.
Confusion with other Macrognathus species at point of sale; jumping; substrate burns from gravel; refusal to take prepared foods initially.
Yes — striped spiny eel (Macrognathus siamensis) is the species most commonly sold under the trade name "peacock eel" in chain stores and aquatic shops.
Peacock eels have multiple distinct eyespots along the dorsal fin without a continuous body stripe. One-striped spiny eels have a single dark lateral stripe running the length of the body and fewer eyespots.
Small snails (assassin-snail-size or smaller) may be eaten. Mystery snails and larger nerites are usually ignored.
No — pure freshwater. Some retail sources incorrectly recommend brackish; ignore this advice. The species is strictly freshwater.
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