Mine wasn't bryopsis, just some kind of scruffy turf algae. The sea hare definitely cleaned off a patch of it when I first put him in there, but then disappeared. Someone at the Planet Reef opening mentioned to me that they had heard of certain fish taking out sea hares in tanks before and that maybe that's what happened to mine. Don't know for sure. At any rate, I've just stayed on top of my water maintenance, running my skimmer a bit wet, added on my phosban reactor with PHOSaR in it, and did the other stuff I did regarding cutting back on feeding and the like, and the algae is 80% knocked back now and still fading.