Do NOT break the bubbles in your tank !!!! There is a good chance the valonia will release spores into your tank, and you will have a much worse problem in a month or two.
When we spot the odd valonia in any of our tanks, the rock comes out and we remove a small portion of the rock that the valonia is on with either a hammer and screwdriver (sometimes breaks the rock) or with wire cutters (sometimes takes a few tries to cut the rock loose around the valonia).
Do NOT let the valonia break while removing it with these two methods as possible spores will remain on your rock and spread throughout your tank anyway !!
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