The Queen Angelfish is very hardy, but it does need an aquarium that is at least 180 gallons (681 l) or more, making it moderately difficult to keep. This angelfish does at times have protozoan parasites that should be treated immediately after they appear. Feeding plant material and preparations with sponge material is very important to their health.At least 220 gallons or more will be needed for a paired male and female or if you chose to put them with a angelfish. Any other angels should not be the same size, nor have a similar color or body shape. These angelfish are very aggressive and will harass new fish added after them, which can make them difficult to find suitable tank mates for. It is important to make sure there are a lot of places to hide and to add this fish to the tank last.
What is an ideal tank size for an Angelfish
There are Angelfish suitable for most aquarium sizes, from Dwarf Angelfish which are well suited to smaller aquaria, to the larger of the species which can be impressively displayed in a larger aquarium.
Minimum Tank Size For 20 Angel Fish? | My Aquarium Club
King angelfish are somewhat popular as aquarium fish, however their large size, specialized diet, and prohibitive cost make them comparatively poor captive pets. They have not bred in captivity and hence can be very difficult to find in most hobby shops, although they are slightly more available through mail order companies, for a price. King angelfish also have a well-deserved reputation for being difficult to keep, largely because they require sponges and tunicates as a food source and will often not accept even prepared foods with such things as ingredients. Besides their diet, they are not particularly picky about or , so long as they are kept stable and the water quality high. Angelfish in general are not generally good community inhabitants, king angels being no exception. If introduced when young, a lucky aquarist may be able to keep two angels in one appropriately size aquarium, but such experiences tend to be the exception, not the norm. King angelfish are quite dominant and can be abusive to smaller or more docile tankmates, or angelfish that are lower on the social hierarchy for whatever reason.
And even that would require some thought
The Bellus Angelfish gets to about 7 inches (18 cm) as adults and seems to adapt well to the aquarium. They are not all that commonly available at fish stores or online and if you do see one available be prepared to pay anywhere from $100 to $200 depending on the size.Angelfish Water Requirements: Angelfish are endemic to the Amazon basin. In nature, they are found in soft, acid water that is very warm most of the year, usually around 80° F. Don't worry if you can't match these conditions in your aquariums. The domestic angelfish, most of which are many generations removed from wild stock, are a very adaptable animal. We have experienced little or no problem raising angelfish in water between 4.7 and 8.7 pH, and from very soft all the way up to very hard water. If your water doesn't naturally fall into this range and is extremely hard or alkaline, the use of a de-ionization filter or reverse osmosis (R.O.) filter can bring it into an acceptable range for you. R.O. filters are usually hooked into your main water supply and produce the near equivalent of distilled water from the tap. The cost of a unit can range from less than a hundred dollars to over $5000, depending on the size and quality of the filter needed. Another means of altering pH is with easily obtained chemicals. This is one method that we prefer to stay away from, because with the chemical method, pH is prone to radical jumps if the water isn't properly buffered. In addition, the fish simply do not like these chemicals. Try to remember that it can be very time consuming to buffer the water, alter the pH, or adjust the hardness of your water supply. If it isn't stable after altering, the swings in pH are more stressful than simply keeping the angelfish in less than ideal water. As we said before, most angelfish varieties will do well in a large range of water types, so avoid altering the water unless all else fails.