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My neon tetras look like they are growing bellies...it looks like either there are bumps on the bottom of their bellies or like they are getting fat....
does this sound like anything important?? are my fish getting sick!?!??! HELP!!!!

My neon tetras look like they are growing bellies...it looks like either there are bumps on the bottom of their bellies or like they are getting fat....
does this sound like anything important?? are my fish getting sick!?!??! HELP!!!!