The Yellow Boxfish juvenile form is easily identifiable as having a yellow box-shaped body with brown spots. As an adult, the yellow will fade and become brown.
This is a very difficult fish to keep in the aquarium setting by any other than the most experienced aquarist. Use caution if placing the Yellow Boxfish Boxfish in a reef tank as they will often nibble at tubeworms. If stressed, the Yellow Boxfish releases a poisonous substance, called ostracitoxin, from its mucous glands which will kill other fish in the tank very quickly.
Very little success has been achieved in breeding these fish in an aquarium.
When first introduced, the Yellow Boxfish prefers a diet of live brine shrimp or bloodworms. Once acclimated, the diet should include chopped squid, clams, mussels, and herbivore preparations.