Well I know that gouramis and Chinese Fighters (aka Betta) are aggressive. A betta can't really be kept with too many other fish as it is territorial and will attack any fish it deems threatening. Gouramis are a species fish and are semi-aggressive, which means it may not be a good idea to have it in with other fish as it could attack and kill them. Angel fish are beautiful but somewhat aggressive and will basically eat anything they can catch and fit in their mouths. However, they are community fish, you just have to be careful. If you have an angel fish, a bad fish to put in with it would be a neon tetra because they are so small.
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