Alright my Zaliosus's pop eye is extremely bad now and his water has been perfect 0ppm ammonia 0 nitites and 5 ppm nitrate. I also have been treating him with Salt, high water temp 85, daily doses of Melafix and a large air wand. He hasn't been getting any better, but infact getting worse. He got it from wacking his head on the heater and now has parasites and leisions on him. I don't want him to suffer anymore so what is a humane way to euthanize fish besides freezing him?