Ive had very little experience with reef tanks, but im have a 38 g tall tank built. Im going to have a refuism, im going to have 60 lbs of live rock, hydrometer and a 20 in light. What my question is.... Im starting it as a fish/live rock, then eventually turning it into a lets say space ish reef tank. What are some good fish that a hardy and wont mess with any corals or inverts??