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Why are my fish eating each others tail fins2007-11-24 23:43:47

maybe they learned it from the other fishies..but arent fish kinda dumb..idk

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Cannibal fish; rare but not unheard of

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Here is part of an answer I used in another question, different problem but answer is the same.

Begin proper feeding of your fish. This may sound funny but there is a right way and a wrong way. This is by far the most common question I get "How do I feed my fish?". The answer is simple, feed fish A LITTLE AT A TIME (they should easily eat all the food you give them) untill ALL fish are done eating. If you do it right most fish will feed for about 5 minutes before they refuse food. You will notice a few fish feed like crazy, not even letting others feed. Those are your dominate fish. If you have ratty tails on any of your fish it was most likely done by one of these dominate fish. The dominate fish always feed first, then they will stop feeding and the others will get their chance. That is why it takes around 5 minutes. A little at a time means a small pinch by the way. Give a pinch, wait for the fish to eat it all or most of it (the idea is to have no waste) then give another pinch and so forth. If anyone ever has high fish loses this is the most likely cause, feeding too much, too fast or not enough. Flake food is great for learning to feed, once you have the hang of it you might switch to a pellet food they have more nutrition per bite. Frozen foods loose most of their nutrition when ice crystals form in the cells and rupture them.

Most likely your fish are hungry but it isn't uncommon for black moors to get picked on in general, not sure why, but it has been something I have noticed over the years.

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1. You might need to feed them more?

2. there could be to many of them.

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I think they are not fed enough. Just give something more but not too much to cloud the water. Have a bigger tank or some stones or objects for hiding will help cos they don't get to see one another too often as in a small tank.