I haven't read of anything about a moonlight gourami being aggressive to anything except other male gourami's so I don't know what to do with it. I can't move it to another tank since the only other tank that we have is a 15 gallon which is not suitable for an 9cm fish. Its in a 25 gallon at the moment with one angel fish (grow out for a 42 gallon that needs setting up). The gourami basically bullies anything that isn't a bottom dweller (my pleco's and pygmy cories) so my tank looks really bare. Is this territorial behaviour or simply aggression?