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05-16-2012, 01:19 PM
Yeah as Jim said, unfortunately unless they are a mated pair they don't normally fair well in multiples in smaller tanks. It can be done but it seems their time has come and for whatever reason (sexual maturity, new food source they want to fight over, new fish has pushed them out into the open, who knows....) they do not wish to co-exist. If the aggression doesn't go away soon (since its been a week already odds are it probably won't) I would suggest attempting to remove one, or they will continue to fight which could lead to losing both fish.
They probably were fine with eachother because they hid so much, or were hiding because they had aggression that you didn't notice before. I would suspect that the new food type is attractive to them causing them to be in the open more resulting in them seeing each other more and heightening their aggression to a more noticeable level.
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