With beautiful body color, the Rectangular Trigger makes a great and stunning fish in any aggressive aquarium. It can be easily recognized with its distinct body shape and thick dorsal spike. The Rectangular Trigger often uses its spine to wedge itself into a hole or crevices when threatened. Once a trigger has secured itself, it is next to impossible to remove it from its hiding place. Since the Rectangular Trigger has spines and rough scales over its body, it may get tangled in the mesh, so use caution when netting this fish. The Rectangular Trigger is a voracious carnivore and needs to be fed a varied diet of meaty foods including freeze-dried or frozen clam, krill, shrimp, and other similar items. It is very active fish and spends most of its time on the open searching for food or chasing other fishes. The Rectangular Trigger cannot be housed with inverts such as crabs, clams, urchins or crabs as these will be seen as a quick snack. Tank mates should be chosen carefully, and the Rectangular Trigger should be large enough and tough enough to hold their own against a feisty trigger. The Rectangular Trigger needs a tank of not less than 70 gallon as it grows up to 18 inches.