firefish jump...so do most wrasses....as far as tangs go, id do either a yellow, a kole, or a tomini. any others get too big for a 75. my favorite combo for a 55/75 is a watchman/pistol combo, an algae blenny, a pair of clowns, a kole tang, a 6line wrasse, and a few neon gobi or other small gobi...