So because I stupidly added water from a wal-mart tank into my tank here at home, a fungus was introduced into my tank and practically destroyed my axie's gills. They're out now, but I was wondering if it would be safe to buy Ick Guard to put in their tank to kill off any fungus that may still be floating around in there. It's a 55 gallon tank and I reaaaaaally dont want to replace all that water (and actually cant right now anyway because our water's out from good ol winter storms).