Just a thought--don't fry me please--but I have majanos in my tank, and in addition to the usual methods (joe's juice, etc...)--if they are on a rock that can come out of the water, I take long fireplace-type Bic lighter and burn them--about 10-15 seconds per majano seems to do it. The rock in the area seems to recover within (visually, anyway) about 4-6 weeks, coraline regrows, etc... I limit t 15 or less per day so dead tissue doesn't cause problems in tank. Red scarlet hermits are there within hours feasting.