Basically a little larger than its mouth. With that fish list it pretty much rules out the small pretty fish (ie. Clownfish,wrasses, gobies), with the exception of damsels... but only because damsels in my experience can move pretty quick and are inexpensive if gobbled up.
You might want to get one of the mods to move this over to the agressive fourm, there will be plenty of people who will be able to help you out there, and give you more suggestions.
-prk543