Both types of angelfish actually belong to the same genus, which is called Holacanthus. Although the fishes belong to the same group, sometimes it can be difficult to add both species in the same tank to live together. Between angelfish, they can become aggressive and it’s not uncommon to see them fighting as soon as you added them. Except when you have a mating pair, it’s very rare to see angelfish swimming together. There should only be one single species in a marine aquarium but they should be able to live well and coexist along with other tropical species like clownfish, blennies and tang.
When it comes to food, Holacanthus can be extremely picky and they only accept sponges most of the time. Due to this, marine hobbyist often have difficulties sourcing for their food supply because only certain pet stores sell it and sometimes they even run out of stock. There are two approaches to solve this, one is to get the largest tank possible which you can afford and then establish your population of live rock with sponges in it or you can choose another way by having a separate tank that grow invertebrates in it. This will ensure that your blue angelfish or queen angelfish will always have enough supply of food for their growth and development.
Find out about other interesting saltwater marine species like the Tang