I had a lettuce slug for about 4 mouths. I liked him. Also moving around, eating hair algae, seemed real healthy. He went MIA one day though. I think he may have fallen on the open brain and became a snack but who knows.
Well, I may be waiting for a while longer on the Lettuce Nudis...The bryopsis is making a comeback (albeit slowly, since I no longer have a nitrate problem) and I'm about sick of it. Since most of my live rock was rock that I seeded from real live rock, I'm thinking of just chucking it and getting some Tonga rock from Dr. Mac. I'll have to cure it for a few weeks, but that's easier to deal with than this PITA.
I know of a local reefer that put their existing LR in a tub of salt water, scrubbed all of the algae they could off, and dusted the effected areas with pure lime(kalkwasser) and rubbed it in then rinsed with ro and reused... they seem to have had success. Could save alot of $$$ and give you the results you want. Hope this helps.