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Well, that one remaining baby RB that I had that I gave to my friend who has a 55 gallon.......I went to visit him last night & He was feeding the baby pirahnas blood worms. He has 6 fish about 1 inch in size in the tank. Minutes after he fed tham, they all went belly up in the tank. We both thought they were dead....lying motionless on the sides on the top of the water. The, a few minutes later, they are all swimming around just fine. He wanted me to do a post to see if anyone has ever seen this before & what it is or may be. Anyone know?