Rock Beauty Angelfish Holocanthus tricolor Identification: Rock Beauty Angelfish are beautiful fish, especially when the yellow and black markings are quite distinct. Maximum Length: 7.9" Origin: Tropical Western Atlantic Minimum tank size: 90 Gallon Feeding and diet: Unlike other holocanthus angelfish, the adult Rock Beauty will usually perish without its normal sponge-dominated diet. It may eat and look good for many months, and then suddenly its color may fade, it will lose weight, and a dark area may appear on top of its head. Ocean Nutrition Frozen Formula One and Two for Angelfish is recommended. Reef Compatibility: They can be kept in reef tanks as they mostly pick on small food off the live rock.. They will however destroy your algae unless your macro-algae are well established and growing very rapidly (which means strong light, and the use of a good reef fertilizer. Next Angel