Tiger Butterfly Loach

An unidentified Gastromyzon trade form with a flattened body and bold tiger-like bars or patches across the back and fins.

Genus-level identification only; no species epithet should be invented.

Mature males may have a squarer head, stronger pectoral-fin rays, or breeding tubercles, while females are usually fuller through the abdomen. These differences are subtle and species identification should come first.

Use a mature aquarium at least 75 cm long with high dissolved oxygen, strong but varied current, and smooth stones exposed to bright enough light for biofilm growth. Provide quieter pockets behind rock and wood, keep nitrate and organic waste low, and use a tight cover.

Tiger Butterfly Loach spends most of its time attached to stone, glass, or wood while grazing and moving between current-facing positions. Males may posture or chase over favoured rocks, but serious injury is uncommon when the footprint contains several feeding territories.

Keep at least 3, preferably 5 or more, where space allows. Multiple grazing zones and broken sight lines reduce competition.

Adults may defend prime feeding stones for short periods. Spread hardscape and food across the footprint.

Choose small to medium peaceful fish that enjoy clean, oxygen-rich water. Avoid warm, stagnant setups, aggressive bottom dwellers, and fish that monopolise all grazing surfaces.

Prioritise high dissolved oxygen, cool-to-moderate temperature, strong surface movement, and very low organic waste. Heat reduces the oxygen safety margin.

A specialist algae grazer. Provide mature, algae-covered stones and supplement with algae wafers and gel foods.

Distribute food across several stones so dominant fish cannot guard one feeding point. Do not rely on algae growth alone.

Reliable captive breeding information for Tiger Butterfly Loach is unavailable because the trade form has not been identified to species. Do not transfer breeding claims from a visually similar species without evidence. A specialist trial would require mature conditioned adults, stable seasonal cues, and protected gravel or vegetation for any eggs.