how long have you had him? how long has it been since you have seen him eat? need more info
Did you try some nori? If he won't eat that, I don't know what to tell you...
no were do i get that
what are you feeding it? you can try soaking the food in some garlic juice to boost his appetite. how long have you had the fish? if new was it eating at the store where you bought him?
I think he means he is not sure if it was eating at the store. did you buy him online or from a store?
Definitely get him some sea weed. You can find it at most Asian stores( it's what they wrap sushi rolls in). Also they carry it at most reputable fish stores. Lettuce is not the best choice of food. Put a big piece on a vegi clip so he can eat as often as possible.
Also next time make sure to only buy a fish that is eating at the store. Have them feed it and buy only if it eats aggressively.
You are't sure what you're feeding it? How big is the tank it is in?