if you can see if you can have your pet store catch you some corys that are eating and schooling while you are in the store..also ask them what thier tank perameters are...in my opinion you perameters are great and if you did properly aclimate them there should not have been a problem but then again i had the same thing happen last week in a well established tank of 2 years...no reason lost 2 julii,2 sterbi,and 2 pandas...it can happen to the best of us..hope we could be of help...ADIOS...
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