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how long of a trip did they make? shipping is hard on some fish, most fish. so they got put into a tank at the store im guessing? then netted when u picked them up and baged again then droive to ur home. then floated and put inot a establiushged tank. with them showing no other sighns other then hiding and swirl typoe swimming and laying at the bottom only 2 things pop up. some type of swimbladder infection or just very very high stress. but now your other fish have ich and the dead tetras did not?