04-23-2012, 12:41 PM
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Agree, if you do not want the species, then leave the existing fish to live out their lives. You could move them to another tank, in order to allow you to do something in the present one, or just leave them until nature calls them. This is what I do when fish groups are depleted through old age deaths or whatever; after a few years it is probably best to leave them.
And i agree with what others have said about the nipping, this species is notorious as nippers. But, different fish in different conditinos can be different than the "norm." And this can go either way, either increasing the aggression or weakening the fish the opposite.
And yes fish see colour, there would be no need for colour on fish if they couldn't.