I was under the impression that mollies are usually not an aggressive fish. We have him mixed with a couple swordtails and we had guppies but the molly bullied them and killed them. I noticed that it keeps trying to mate with the other fish, is it possible that not being able to mate with a other fish is causing it to be aggressive? We have a 30 gal tank, water levels are great. I just need some ideas to chill this fella out if possible.