Orange Fin Goby (Stiphodon Maculidorsalis)

Orange fins flicker over swift freshwater stones.

The Orange Fin Goby (Stiphodon maculidorsalis) is a peaceful, algae-grazing freshwater goby ideal for mature, high-flow aquariums with rich biofilm.

• Water conditions: The Orange Fin Goby is best kept in stable freshwater with a temperature of roughly 22–27°C, pH around 6.8–8.0, and moderate hardness (GH 5–12). These gobies come from flowing, well-oxygenated streams, so surface agitation and strong water movement are important. Aim for a turnover rate that creates visible current through rocks and decor, while leaving a few calmer pockets for resting. Ammonia and nitrite must remain at zero, with nitrate kept low through regular partial water changes. A mature aquarium is strongly recommended because Orange Fin Gobies graze continuously on biofilm, algae, and micro-organisms that develop on rockwork and wood. Avoid placing them in a newly cycled or sterile tank, as they can struggle to find enough natural food. Stable parameters matter more than a precise pH value, so drip-acclimatise carefully and avoid sudden shifts in temperature, hardness, or salinity. Although related gobies are amphidromous, adults of this species are maintained in freshwater in the aquarium; breeding is not expected in home setups because the larval stage requires a brackish-to-marine phase.
• Suitable tank mates: Choose peaceful, small to medium community fish that will not bully or outcompete the Orange Fin Goby. Good companions include small rasboras, danios, tetras, peaceful livebearers, and modest-sized rainbowfish suited to flowing water. Bottom-dwelling tank mates should be gentle and not overly boisterous; small Corydoras, peaceful loaches, and non-aggressive shrimp can work in a well-structured tank, though shrimp fry may occasionally be taken. Avoid large or aggressive cichlids, territorial bottom dwellers, crayfish, and fast-eating fish that would clear the tank of biofilm before the goby can graze. If keeping several Stiphodon gobies, provide plenty of rockwork, cobbles, and visual barriers, and keep a close eye on males, which may display territorial behaviour. A 60 cm aquarium is a practical minimum for a small group, while a 90 cm or larger tank with a mature biofilm network is better. Always quarantine new livestock and avoid mixing the Orange Fin Goby with species that require very different water conditions, such as hard, still, or brackish aquariums.
• Feeding habits: The Orange Fin Goby is primarily an aufwuchs grazer, rasping algae, diatoms, biofilm, and associated micro-organisms from rocks, wood, and glass. Its natural feeding style is continuous browsing rather than large meals, so a mature tank with visible soft algae and biofilm is essential. Offer supplementary foods such as spirulina wafers, algae pellets, Repashy-type gel foods, and blanched vegetables like courgette, spinach, or cucumber. Small amounts of frozen or live foods, such as baby brine shrimp or daphnia, can be given occasionally, but they should not replace the algae-based diet. Feed small portions several times daily so the goby can graze without overwhelming water quality. Watch body condition closely: a sunken belly or constant glass-crawling can indicate insufficient food. Avoid keeping Orange Fin Gobies in spotless, heavily scrubbed tanks, and do not rely on them as a “clean-up crew” for problem algae. They need a steady supply of natural grazing surfaces, and competing algae eaters may need to be limited.
• Care requirements: Provide a well-aerated, high-flow aquarium with a secure lid, as gobies can be accomplished jumpers. Use smooth cobbles, porous rocks, driftwood, and a sand or fine-gravel substrate to create grazing surfaces and hiding places. Strong current from a powerhead or filter outlet should be directed across rockwork, but include sheltered areas where the fish can rest. Keep the tank biologically mature, maintain excellent oxygen levels, and perform regular partial water changes without disturbing the biofilm completely. Orange Fin Gobies are sensitive to poor water quality, low oxygen, and abrupt changes, so avoid overstocking and overfeeding. Observe new arrivals during acclimation and quarantine them where possible. They are generally peaceful and reef-safe in temperament but are freshwater stream fish, not marine gobies. With stable conditions, a mature grazing environment, and peaceful companions, the Orange Fin Goby makes a fascinating and active addition to a flowing community aquarium.