Tank specs: 20 gal - 0 ammonia, 0 nitrite, ~80 nitrate, ph 7.4-7.6 or so Hi all, I've got a sick Amazonian puffer here (Charlie) who I'm really fond of. I've put him in a quarantine tank for now. He hasn't eaten in a few days, and has been lying on the bottom of the tank, today I came home and he was lying on his side, so he's definitely getting a lot worse. Seems like today or tomorrow might be his last day unless I take drastic action. :/ Any idea what's wrong with him? I have salt, melafix, Maracyn, Maracyn II...haven't used anything on him yet because I don't want to make it worse, but definitely something has to be done. Thank you.