we have a 220L tank with discus and clown loaches, sharks, we set it up on sunday(as we moved it)monday i noticed a thin film on the surface, fish all panting fast discus at the top rest on the bottom, did a 15o/o wc, then all fine and happy today same thing, but no film, help whats the cause.
tank is running two canister filters, ph fine and nitrate fine, we just bought discus on sunday(5)