The butterflyfish are one of the most common fish in a coral reef. They are usually very bright and multi-colored. There are 114 species of butterflyfish and they all eat little things like worms or other small invertebrates. Some travel and schools but some travel with just one partner that they will have for life. They can grow up to 8 inches and they are omnivorous. One fun fact is that at night, when they snuggle down into a dark crevice, their bright colors fade to camouflage with their surroundings.