actually,
i think for moorish idol, the first thing is of course feeding. but unlike other difficult fishes, even when your moorish idol start to eat like pig, eat mysis, pellets and so on. it will still get thinner and thinner and eventually die off.
i tried 2-3 moorish idol before, all feed on mysis, clam and pellets but eventually they will just die for no reason. like feeding in the morning before i leave for school, noon when i am back, they just die. think maybe its the way they catch it, maybe its due to cyanide catching..