I have a couple of fancy looking goldfish (fat bellies and lonk swishy tails and fins) and one has a swim bladder problem and has gone all floaty. I went to the petshop and they gave me Interpet Swimbladder Treatment which I have dosed into the tank but I had to take the filter out so it didn't filter out the medicine. My question is should I put the filter back in without the sponge thing in it or leave it out altogether or what???
TIA