I have a neon blue dwarf and he is a little tyrant. He harassed the other dwarf to sickness and now that I've quarantined the sick one, the little tyrant is terrorizing everyone else in the community tank. He sends platies, cories, zebra danios, neon tetras and my larger pearl gouramis swimming away fast in fear. They have all been living together for 2+ months and it's been during the last couple weeks that he's been getting nasty, esp. after the removal of his sick buddy. It's too late to take him back where he came from; what can I do to mediate? If I get a couple more dwarf gouramis, will that spread the aggression only amongst themselves? There are plenty of hiding spaces in the tank, though only a corner of the tank has floating plants-which he claims for himself. Maybe I should get some more top cover? I'd get females, but I cannot find any in my area.