How to get rid of Valonea algae?

[Stones]

Yeah, that's what I have been noticing with my emeralds too, that they go after any algae (or coral polyps....) without touching the valonea.

[sharuq1]

A related question: How do you be rid of it when it is right on your coral? I have a small bubble that always comes back on my hammerspawn and am scared to try harsher methods due to it being so close to the head/polyps.

[Reefer Rob]

Is it far enough away to shield the polyps with a oyster shell, or even cut a piece of plastic as a shield.