King Angelfish are commonly available in stores and online, and range in price from expensive to very expensive, depending on size.
The foods they eat are somewhat dependent on their size and sex. Juveniles mostly eat algae and are cleaners of larger fish like snappers, groupers, grunts, and goatfish. All adults consume various types of algae, sponges and to a lesser degree invertebrate eggs, cnidarians, and zooplankton. Large males at the Galapagos Islands feed on the feces of Scissortail Chromis , but females from this area are more into algae and benthic invertebrates. Adults, both male and female, have been known to regularly clean off large copepods from Scalloped Hammerheads These pests bother them to the point that these Hammerheads will descend to the depths that the King Angelfish is found for regular cleanings!
The King Angelfish, Holacanthus passer, has various color morphs from juvenile to adult. Adult King Angelfish will clean Hammerhead Sharks, so hey if you happen to have a tank the size of most houses, get one! Otherwise a tank that is at least 135 gallons minimum is need for proper growth for this 14" angelfish! It is odd, but large angelfish, if their growth is stunted by a small tank, will result in their death! Their organs will grown to proper size, but if the body does not make it to the correct length, these organs are in essence are crushed, leading to death in about a year or so.
Minimum tank size of 1 Angel fish
The maximum size of the Koran Angelfish is 15” (38 cm)
The Regal Angelfish is being sold for around $75 to $250 depending on size and location collected. Since the Indian Ocean regals are adapting better they are going for higher prices.Angelfish are not streamlined enough to do well in tanks with a lot of current. We recommend sponge filters, undergravel filters, or bubble-up box filters. If you have a large tank and want to add a secondary undersized power filter, canister filter or fluidized bed filter, it will be okay as long as it is considered too small for that tank size. Angelfish are naturally carnivorous, so they need to be fed the right foods to help them reach optimum size and remain healthy. It's usually best to offer a daily feeding of or a pelleted diet formulated for angels, and then supplement the fish with of freshly-hatched brine shrimp, bloodworms and daphnia grown from your cultures to avoid contaminated sources. Filters are designed to handle bio-load, not a particular tank size. Although companies tend to rate their filters to tank size, this is incorrect. Filters are capable of containing a certain number of nitrifying bacteria that will consume a particular volume of ammonia and nitrites. A certain sized bio-load in a small tank will require the approximately the same filtration as the same bio-load in a large tank. However, since the tank walls and other items also contain nitrifying bacteria, the same bio-load in a smaller tank will require a slightly larger filter size then the large tank. To rate filters, try to compare volume of sponge used and the density of the sponge. Our opinion is that bio-filtration is typically not a limiting factor in most tanks. It is more important to get a filter with a good design. The best filters are ones that get the sponge close to the bottom of the tank, which will improve water movement to the filter and gas exchange at the surface. You also need a filter that small angelfish will not get trapped under. Our sponge filters handle this combination of factors better than any other, in our opinion.