Angelfish have likely drawn more folks to marine aquarium keeping than have any other of the sea’s creatures. Fantastically-colored in an array of bold, unique patterns, Angelfish exemplify the beauty of the world’s reef fishes. Happily, many are also quite hardy, although they do demand pristine water, a varied diet, and plenty of space. Most top out at 8-12 inches in length, and require a tank of at least 125 gallon capacity. There are also small species that will be comfortable in a 55 gallon, and a few 15-24 inch giants. Their beauty, however, belies an aggressive streak –with the exception of mates, Angelfish are generally intolerant of others of their own or similar species.