09-10-2013, 09:37 PM
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If you're going to breed fish with any specific goal in mind you do have to come to terms with deformed & runt fish. Often external deformities will also manifest as unseen internal deformities, which generally means a much shortened life for the deformed or runt fish. Everyone including myself has tried saving the poor deformed or runt fish, stock them lighter, feed them better, overall increase in maintenance above what you would normally do with breeding. It doesn't take long to find out that they don't lead a normal and full life, rarely hitting the 1 year mark with angels.
This leaves you with two options, euthanasia or an ongoing tank(s) for deformed fish. If you get busy with breeding, with hopefully some goals whether they be improving a particular trait, making a few dollars on the side, or whatever, you'll soon find that those misfits tie up a lot of tankspace that hinders obtaining your goals. One of the more common ways of dealing with culls in a larger breeding setup is to keep a larger fish that will eat smaller culls, I had an oscar for years, and now have an acara that serves this purpose.
You're not doing the hobby any favors by selling or otherwise moving on deformed fish, as eventually someone will breed them, most often weakening the species. Culling is without a doubt the most difficult part of breeding, but as with many things in life you have to take the bad with the good.