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Yup, I'm going to look into that.Saltyreef's suggestion is the best, but if the algae is stubborn, You can dunk it in a hydrogen peroxide bath to kill the algae, google for more info, there is lots of info online.
I use 50/50 salt water and peroxide, dunk it for 3-4 minutes. The zoa will be unhappy and will take a couple of weeks to open up again, but the algae will die in the peroxide. Then rinse in saltwater and back into the tank.
I've only done this with zoa's only, and it works, I've not tried and would not suggest this for any other coral