I have a few discus and some plecos that are sick. The discus are floating upside down and have been for 2 days, but they don't look any weaker. The plecos aren't eating anymore and don't move at all. I've looked at them, but they aren't showing any signs of disease (that I know of), so I treated the tank with Stress Coat... but it didn't work. Is there anything else I can do to treat them? If not, do I have to kill them?
How do I kill them humanely? Please help!
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