question? iI HAVE A DOG FACE PUFFER.THE LAST THREE WEEKS NO PROBLEM BUT SAT.2/12/00 DONE A 15% WATER CHANGE AND SOMETHING HAPPENED, THE PUFFER STARTED SPASMING BEING LETHARGIC. CANNOT FIGURE OUT WHAT WENT WRONG.(1)I CHANGED ANOTHER 10% WATER OUT ,(2)THOUGHT MAY HAVE GOT SOMETHING ON AIR DIFFUSER(STONE),CHANGED STONE AND AIRLINE TO NEW ONE. HAVE BEEN FEEDING FROZEN FOOD FOR THREE WEEKS ,NO PROBLEM ?COULD IT BE THAT HE ENGULFS THE FOOD TO FAST ?HAS PROBLEMS DIGESTING OR WHAT? CONFUSED PLEASE REPLY.