It is a male Sphaeromatid! I emailed several people. It is amazing all the sites out there for these pods.
Sphaeromatids are small bugs, generally less than a centimeter in length. They are common scavengers in many shallow marine environments, including coral reefs, and they are harmless to reef aquarium inhabitants. They can be recognized immediately by a couple of distinctive characters. First, each individual has the capability to roll into a ball-like terrestrial pill bug. None of the other isopods likely to be found aquaria will be able do that. Second, when examined with a hand lens or magnifying glass, the last pair of appendages of the males are expanded and extend to the rear, like small rudders or the fins on a 1959 Caddy. Females lack these extensions, but if some of the isopods are seen with them, that is usually a good indication that the rest of them are also Sphaeromatids. If it cannot roll into a ball it may be a Cirolanid.