The Halfmoon Lunula Trigger (Rhinecanthus lunula) is a stunning addition to any marine aquarium, showcasing vibrant colors and distinctive patterns. Growing up to 10 inches in length, this triggerfish requires a spacious tank with plenty of swimming room and hiding spots. Offer a varied diet consisting of high-quality pellets, frozen foods like mysis shrimp and brine shrimp, clams, snails, and crabs to help keep their teeth trimmed, and occasional treats of marine algae to ensure optimal health. Keep water parameters stable, with a temperature range of 72-78°F, pH of 8.1-8.4, and specific gravity of 1.020-1.025. Regular water changes and diligent maintenance are essential to prevent aggression and maintain water quality. Additionally, be mindful of tank mates as the Halfmoon Lunula Trigger can exhibit territorial behavior.