The Rhino Horn Goby (Rhinogobius sp., often referred to as "Rhino Horn" due to the small horn-like projection on the head of males) is a small, bottom-dwelling freshwater goby found in cool, fast-flowing streams of East Asia. They thrive in aquariums that mimic this environment with smooth rocks, sand or fine gravel substrate, and strong water movement to provide oxygen-rich conditions. These gobies are generally peaceful but can be territorial toward their own kind, so keeping one male with several females or maintaining them in larger aquariums with plenty of hiding spots is ideal. They are omnivorous, feeding on small live or frozen foods such as bloodworms, daphnia, and brine shrimp, alongside some prepared sinking foods. Cooler, clean water is crucial for their health, and they do best with regular water changes and stable conditions. Breeding can occur in aquariums if caves or crevices are provided, but fry are challenging to raise.
| Parameter | Requirement |
|---|---|
| Scientific Name | Rhinogobius sp. (“Rhino Horn Goby”) |
| Tank Size | Minimum 15–20 gallons |
| Temperature | 18–24°C (64–75°F) |
| pH Range | 6.5–7.5 |
| Water Hardness | Soft to moderate (5–15 dGH) |
| Flow & Oxygenation | Strong water flow, high oxygen levels |
| Diet | Live/frozen foods (bloodworms, brine shrimp, daphnia), sinking micro-pellets |
| Temperament | Peaceful but territorial males |
| Social Behavior | Best kept singly or in harems (1 male : several females) |
| Breeding | Cave spawner; eggs guarded by male, fry are difficult to rear |
| Lifespan | 3–5 years with good care |