There's been some interest in colonization of the reefs. Planet's gravity is heavier then earth normal but, still habitable. The ecology is biocompatible with humans and a few other kinds. Problem is the low amount of metallics, but hey, they have a dozen metal moons so that shouldnt be too bad.

It's kind of a novel idea, apparently the corals self regulate based on altitude and pressure. Add more weight to a reef and they either grow, or overproduce hydrogen. Remove weight and they go dormant until they are at their altitude. There is so much we don't understand about them either.