The Catalina goby is a very interesting and attractive fish, and they will actually do fairly well in an aquarium environment – but they are not a tropical fish. This cannot be emphasized enough, and if they are being sold in a local fish store without the potential purchaser being told that they are temperate, not tropical, then that fish store is doing the fish, the customer, and the hobby a disservice.
That said, the Catalina goby is an excellent fish to keep, in a temperate aquarium. By temperate we mean that the water temperature is kept between 60 and 65 degrees F. This is an ideal fish to keep in one of the “nano-tanks” that are around five gallons in size. Put in some live rock, a few crabs, and a Catalina goby and you will have a nice little display.
Catalina gobies adapt very well to aquarium life as long as the temperature is correct for them, and they will eat just about anything. Being a goby they like to hang out in rocks on the bottom of the tank, and they will constantly be looking for little morsels. Feed them any of the standards prepared dry or frozen foods, and for a special treat you can toss in some live brine shrimp or copepods once in a while.