Angelfish, Large Marine Large Angels are among the most popular fish for the home saltwater aquarium, and most marine angelfish adapt well to captivity. The diet of Large Angels consists of microalgaes, macroalgaes, sponges, and zooplankton. It is advisable not to introduce Angels from the same genus into one aquarium, as fighting will usually occur. Looking for Dwarf Angelfish? | Freshwater Angelfish?