Often overlooked because of it’s plain appearance, the Keyhole Angelfish is an excellent addition to a larger marine aquarium because of it’s usefulness at eating filamentous algae and diatoms growing on the decorations and rockwork. This dwarf Angelfish is one of the largest of the Centropyge (7.5”) and can become quite aggressive toward other pygmy angelfish which are not introduced at the same time. This is one of those Centropyge Angelfish which must be kept in an aquarium utilizing live rock for filtration or decoration. They have been observed picking at stony and soft corals as well as clam mantles but we have had individuals live happily in full reef tanks for years with no problems. Keep an eye on the fish if you have coral and adjust its diet if you notice it bothering sessile invertebrates. It will not harm or even notice non-sessile invertebrates such as shrimp or crabs.
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