Aggressive community tanks that are too small turn into "fish thunder dome" EVERY TIME. 2 FISH ENTER I FISH LEAVES- Or both fish kill each other that happens too. The worst part of working at a pet store was selling fish to people who want a "friend" for their monster. Your monster doesn't want a friend it wants victims. Even if you find something "compatible"... What's the point of keeping a bunch of tattered in eyeless fish that hide in their respective corners?