How is your nutrient export? Doing water changes, have a good skimmer and good circulation to prevent detritus from building up? When doing water changes I like to use a turkey baster to blow out all of my rocks when doing water changes, this really helps to get rid of phosphate making debris. The anemones themselves probably aren't contributing much to your problem unless you are feeding them directly all the time. I've never bothered to directly feed any of mine and they do just fine with good light and whatever they get from the water column.
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