Saltwater butterflyfish for sale on aquariumfishsale.com look similar to marine angelfish with some difference in the fin structure. Like angelfish, some butterfly fish can grow to a foot in size and display beautiful colors in the marine aquarium. The Butterflyfish family contains 129 species and include the bannerfish and coralfish. All butterflyfish are pelagic egg layers - the fish release their eggs to blend and float with the surrounding plankton until they hatch. Butterflyfish are found in reefs of the Indian, Pacific, and Atlantic Oceans.