I had 2 Golden Gourami, and they can be pretty mean fish. In the end, one of them wouldnt come out of his hiding place, because as soon as he did, the other one would attack him. I woke up one morning to find that my Beta had no fins at all. In the end I took the Gourami back to the shop. If you ask me, this rule applies to all Gourami. I now have 2 Robin Gourmai, and although they are not quite as bad as the Goldens, they can still be aggressive. Its a shame because I really like Gourami. BTW, Gourami and Beta will usually fight each other if they are of a similar size.....they both come from the same Genus.