If it is a gold algae eater, as in the gold version of the chinese algae eater, I have seen so many of them in tanks together, some gold, some silver and grey and some mixed. Not sure if they breed together, but I think they probably do, maybe someone else knows? It would make sense though, if they are just different "colour versions" of the same fish. They seem to almost always be kept in the same tank at stores. I have seen some really cool patterns!