Red Neon Goby

The red neon goby is a small, strikingly coloured member of the Sicydiinae subfamily, native to short coastal streams on tropical islands across the Philippines, southern Japan, Taiwan, parts of southern China, and Malaysia. Males have a greyish base colour with a bright blue to greenish lateral stripe that can appear nearly whitish in dominant or breeding fish; the outer edge of the first dorsal fin is yellow to reddish, while females are more subdued in silver and brown tones. True to their genus, these gobies have fused pelvic fins forming a suction cup that allows them to cling to rocks in fast-flowing water, and they are amphidromous — the fry drift to the sea to develop before returning to freshwater streams as adults.

Stiphodon gobies require very specific aquarium conditions to thrive. They need well-oxygenated, crystal-clear water with strong flow — a powerhead or high-turnover filter is essential. The tank should be at least 54 litres with a mature substrate of smooth pebbles, cobbles, and fine gravel that allows biofilm growth, which forms the bulk of their diet. Water temperature should be 22–26°C with a pH of 6.5–7.5. These gobies are naturally found in streams above waterfalls, and they are exceptional climbers, so a tightly covered aquarium is mandatory. The tank should be allowed to develop a rich growth of algae and biofilm on rocks and decorations before introducing them, as this is their primary food source.

Despite their small size of around 5 cm, these fish are not typical community fish. They are peaceful but strict herbivores (or more accurately, aufwuchs-feeders), grazing continuously on biofilm, microalgae, and the tiny organisms living within it. Supplementary foods include high-quality spirulina-based wafers, blanched vegetables, and repashy-style gel foods, but nothing replaces a mature, biofilm-rich tank. They are best kept in groups of four or more where males will display their finest colours. Tankmates should be peaceful and non-competitive for food — small rasboras, other Stiphodon species, and nerite snails work well. Avoid all aggressive or bottom-dwelling competitors. Their specialised dietary needs and requirement for pristine, high-flow water make them best suited to experienced aquarists.