Ok...so this might be a stupid question, but how do you break DOWN a hospital tank? The fish I had in there died (not surprised). I was thinking of using a 10% bleach solution to disinfect the tank & media ( a single plastic plant, a rock, and a thin layer of gravel to provide a bottom)? What about the sponge filter? It was the secondary on my main tank that I have going in order to be able to transfer it to the hospital tank...but now I'd like to transfer it back without contaminating my main tank. It's just a sponge-filter. Do I soak it in 10% bleach too (then dechlorinate). Or will this ruin it? Or boil it? I know it won't transfer back any good bacteria...I just don't want it to transfer back bad bacteria either. Do I need to just get a new sponge? I'd like to get it back onto the main tank so that I can get it ready for the next time I'll need it. Thanks in advance.