That's a pretty nasty looking aiptasia in the upper right corner of that pic
You can cut the mushroom cap off and use rubber bands and tulle netting to encourage the cap to affix to another piece of rock.
OR you can butt another piece of rock up against it and "encourage" it to move onto the new piece of rock.
HTH
Jenn
__________________
Member of the "J" Crowd & the BRW Crowd!
LFS Owner:
Imagine Ocean

Just keep skimming, just keep skimming, just keep skimming, skimming skimming! What do we do? We skim, skim, skim!