just got a new blue cichlid ... not too sure of the fancy name? but i found it dead the day after i got it so i put it in a bag and was about to return it at the fish store when i looked in the bag it was perfictly fine?!??! so i put it back inn the tank and it was fine....??? so about an hour later i noticed it spaz out and did a few flips then looked dead agian repeated the bag process and it was fine agian....so i have the bag folded over on the edge of the tank and the fish in it im afraid to put it back in the tank just incase it really does die???? should i just take it back and tell them its inaffective ??