Charlie is very lethargic and at the surface on his side whenever he isnt making an effort to move about. Ammonia spiked yesterday so I had changed about 40% and then again today I changed about 40%. He isn't recooping and I'm wondering if it's something else. I've lowered the water again down to about halfway up the tank so he won't have to exert so much to eat. Any suggestiolns welcome.