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ThanksI've dipped in heavily diluted peroxide for 5 min when bad enough after trying qtips, droppers and brushes first. So far it's just been zoas and palys that have had this issue. It does stress them out for a couple weeks. Make sure they're closed before dipping. Also found asterea snails do a good job of cleaning afterwards.
ThanksNot sure what type of algae it is but I use a small brush dipped in hydrogen peroxide to carefully scrub plug avoiding coral followed by a good rinsing with tank water.. a standard issue GI M4 cleaning brush works great for this.