Starting up a new aquarium and i don't have space for a quarantine tank in my room, putting my cleaning crew and dither fish straight into the aquarium. Before i put in any main fish (maybe discus and expensive catfish) I'd like to disinfect the aquarium but i'm not to keen on anything containing malachite green. Will a hearty dose of excel do the job? I think the tetras might have brought in some ich and maybe some other stuff, quite a few have been dying.