Indostomus Paradoxus Loach

Indostomus paradoxus is one of the most extraordinary freshwater fish available to aquarists — a tiny, armour-plated species from Myanmar that looks and moves more like a pipefish than a loach. Placed in its own family Indostomidae, it is the sole representative of a genuinely ancient and isolated evolutionary lineage. The body is encased in bony scute-like plates and the fish moves with a deliberate, hovering motion using its pectoral fins.

Care is specialised: a small, mature, well-filtered nano aquarium with gentle flow is ideal. The species is easily out-competed for food by boisterous tankmates and must be kept either alone or with the most docile nano companions. Water quality must be excellent and stable. Despite its diminutive 3 cm size, Indostomus paradoxus is a long-term captive that rewards patient, attentive care.

Feeding requires small live or frozen invertebrates: baby brine shrimp, micro bloodworm, and daphnia are the staples. Dry foods are rarely accepted by newly imported specimens though some individuals can be trained over time. This species represents the ultimate rarity in loach keeping — a living fossil that bridges the gap between multiple fish lineages.

Water: pH 6.5–7.5, temperature 22–27°C, very clean, gentle flow. Tank: 30 L minimum; fine substrate, Java moss, gentle filtration, species-only or docile nano companions. Feeding: Baby brine shrimp, micro bloodworm, daphnia; rarely accepts dry food. Breeding: Reported in species-only tanks; male guards eggs deposited in plant mass. Compatibility: Keep only with the most passive nano fish or invertebrates; easily outcompeted.