I've just finished treating my fish with melafix for a week and tomorrow i will do a 25% water change. Question: do I put the black sponge back in tomorrow to get rid of the medication thats left in the tank or wait for a few days? Thanks
If you are completely sure that your fish have recovered, add the carbon (The black sponge contains carbon, right?) To be safe, let the remaining melafix stay in the tank for a couple days before removing it
