Gobiodon Okinawae The Yellow Clown Goby are a small stocky shaped fish with a very large head for their size. They are a peaceful fish that makes a wonderful addition to a reef aquarium containing colonies of polyp corals, as they enjoy swimming and hiding amongst the polyps. However, they may nip at the polyps of SPS corals. It requires a 10-gallon or larger aquarium preferably with branching coral. It will rarely become aggressive towards other fish, but will fight with its own kind in smaller aquariums. It is best if it is kept with other docile species. The Yellow Clown Goby's diet should consist of a variety of carnivore preparations.