Suddenly my, approximately 4 year old, Jurupari is not feeling so well. He suddenly stopped eating and just hides and sits near the bottom. Normally when I lose a Jurupari, it is because of water conditions and they are gasping for air at the top of the tank. The water is fine and there is no sign of disease on the fish. This has been going on for almost a week now. He comes out periodically for a swim, then just goes back to hide and sits at the bottom. Right now, his head is very grey. It's just him, a 12 inch Oscar and 3 plecos in a 120 gal. Any ideas? What is the lifespan of a Jurupari in captivity? I've never had one last this long but again, all the others were victims of high nitrates.