I am unsure what would make good tank mates for one. We are being given a ten gallon. In the past I had a male in with some mollies, I know for a fact he kept eating the fry from the mollies. Was that wrong? I was never told it was and he lived for almost 2 years before we had a black out and water main break simultaneously that went on for over 2 weeks and killed all the fish. That was about 6 years ago. I considered maybe some females but have read they might be agressive to each other. Would Cory cats be ok? Swords? Neon tetras? Suggestions? Many thanks!