By the way, and I know this may be a special case, but my Moorish Idol is easily my favorite fish. He/she has a fantastic personality, really a wonderful fish. It'll come up and eat nori from my fingers, it's always inquisitive about what's going on outside the tank, and all around is a wonderful fish (companion?).
It sort of makes me sad though when I think about it - this is an animal that obviously has some personality, maybe it can't "think" per say (maybe it can?) but sometimes I think it'd be happier in the ocean. At least I seem to be doing a good job caring for it - mine's plump, colorful, and active.
I got this fish on 3/22/2010 from the LiveAquaria divers den. It's been through algae outbreaks, a blueline that got terrorized by my coral beauty, and a really bad runin with a gorilla crab that left it with a huge gash on it's side. It's been through vacations with less than perfect "helper" fish care, a few months in a 30 gallon hospital tank with a round of medication, frozen food, pellet food, fresh nori, biopellets, a Calcium reactor going off line, biopellets going online and offline.. it's a trooper!
I'm not sure I'm going to say that Moorish Idols are easy to care for. I've not had mine 2 years yet. I feed Rod's Reef vegetarian food twice daily, with NLS pellets 4 times daily in between frozen food. I feed additional cut up nori once a week as well for the tang. I keep the tank around 77. Other than that, I don't do anything special to keep this fish alive. It'll be a sad day when/if it dies though. Really, a great animal with all the personality of my Dalmatian.