Problem with buoyancy after eating

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Candiru
MFK Member
Apr 28, 2009
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I recently got 2 very small (ones the size of a quater the other is slightly smaller.) red bellied piranhas. I have been feeding them brine shrimp for the first few weeks because being as small as they are I didn't want to feed them anything to big at first. So my question is after every feeding both fish, but espicially the small one, seems to lose their ability to control movement vertically in the tank. He frantically trys swims to the bottom for a while eventually giving up and floating at the top of the tank or hiding in the plants to keep from floating up. After a hour or so i'll check and he is perfectly fine swimming like normal. Any Idea what this could be?
 
Maybe that kind of food is turning out to be a bomb for their tiny bellies and it is hard for them to digest it remember they're babies do not expect them to react as a grown individual.

Feed them bloodworms and artemia until they are big enough to other foods.
 
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