I have Lobophora too. I have tried everything I could think of to get rid of including tons of CUC creatures (all snails), an emerald crab, scraping, an algae blenny and vodka dosing. The vodka dosing indeed brought down my N and P to undetectable levels and the sps corals loved it, but the Lobophora also loved it; it seems happier than ever and spreading.
So, today I gave up and bought a Sally lightfoot crab. Yikes! I am worried that it will try to eat my coral polyps or a small fish or snail. But, I want that Lobophora gone; it is ugly and takes up room that should be for coralline. I have discontinued vodka for now, but will take that up later, when things look better.
I have heard (Pam) that to trap a crab, you can lean a tall drinking glass against the live rock with some nice food at the bottom. Do this at night and supposedly, by morning, the crab may be in the glass, stuck, because it cannot crawl out. Is this what you did to catch yours? I hope you see this post; it's been awhile.
Thanks!