Smtarr, there is a thread on here with many pages devoted to Idols. Since you live in Maine you can collect sponges. I collect them here in NY. They are the disguesting mushroom looking stuff that grows on docks and pilings. Moorish Idols love it and sponge is their main diet. I did a lot of diving with them in the South Pacific and thats all that I ever saw them eat. There are a lot of pictures of it in my gallery. Some Idols, like mine do not touch corals while some tear them up. If you decide to buy an Idol, make sure it is eating in the store and see what it is eating. They are not the easiest fish to keep.
I have plenty of Viet Nam experience and you are a year younger them me.
Take care.
Paul