Hello,
A good place to start hunting for rare fish is the Tropical Fish Finder web site. It has a database where you type in the species, in this case Gobioides, and then hit return, and lo and behold you get a bunch of species matching your description with a "stock" button that takes you to whatever stores has them. In this case, it says Fins Feather n' Fur in Heston has them in stock. The downsisde is that only some aquarium shops are in the database, not all of them, and the database is only as reliable as the shops that update their entries. But the better stores like BAS, Wildwoods, Wholesale Trops and so on are there, so it's a good start.
They are territorial and mutually somewhat aggressive. They can be kept in groups, and people often do, because it is fun to watch them displaying to one another. They line up alongside each other and flutter their fins and generally try to look threatening. In a big tank, no harm is done, but you probably want to set aside something like 40 gallons per fish, and certainly make sure each fish has its own cave.
You can mix them with anything you want, but the main thing is to ensure they can feed properly. They are filter feeders primarily, and appreciate frozen bloodworms and live brine shrimps. They also need algae in their diet. Broken algae pellets work fine for this. But you do need to make sure the gobies get a chance to feed. They are quite large and can't survive on nothing. Monos, scats, etc. tend to steal the food because they are so much faster. These gobies will feed at night, so that may be one solution, althernatively you could try feeding the goby directly with a turkey baster to "squeeze" food into its face so that the monos and scats won't steal it.
Sands substrate and SG 1.007 is ideal.
Cheers, Neale
