Ok, so i recently got a naso tang. he was doing good, i never see him eat. today i woke up and he was laying on the bottom. i thought he was a goner, but then touched him and he swam around for a little then went back to the same spot and just layed again. I feed flake and pellets. ive heard they love to eat and i never see him eat and isnt doing well any ideas?!?!?