The Undulated Trigger Fish is also known as the Orange-lined Triggerfish or Orange-tailed Triggerfish. With its emerald-green body and yellow-orange vertical stripes, it makes a captivating addition to a species specific tank. The Undulated Trigger should be kept in a tank not less than 55 gallon, and with large pieces of rock to form caves is ideal. It has a unique behavior of making ?grunting? sound, as if the fish is talking. The Undulated Trigger is hardy to keep in a saltwater tank, but the fish is considered aggressive towards other fish in the tank. Although it can be shy at the time of introducing in the tank but soon get over this behavior quite quickly and gains a belligerent attitude eventually. We recommend you to use precautions while handling this Undulated Trigger fish, since it can bite your finger and inflict painful wounds. It grows up to 12 inches in length in the wild and looks lovely while swimming in the well decorated tank. The Undulated Trigger thrives well in a temperature range of 72-78 degrees Fahrenheit and pH of 8.1-8.4. Since the Undulated Trigger is carnivorous, it should be given a diet that includes meaty foods such as live shrimps, live fishes and sometimes crustaceans. Being an inquisitive fish, the Undulated Trigger should be provided with plenty of space to explore. Although it is hardy and aggressive, it can be kept by beginning hobbyists, assuming they have a large aquarium. The Undulated Trigger may also bite or chew on pieces of rock or coral in order to keep its ever growing front teeth worn down. It is named a triggerfish because when frightened it wedges itself into a tight crevice and anchor itself by erecting and locking its first spine; and when the second spine is depressed, it acts as a trigger. Being a messy eater, the Undulated Trigger creates a fair amount of waste, which should be filtered out using biological filtration.