This is how I handle mushroom and rics, yumas,... I put them, the lose ones, in a small container with crushed corals and put the container in the low flow area. When they grab on to the small crushed corals then I glue the crush corals to the rocks that I want.
I found negotiating with the mushrooms much more effective than glue. Like anemones, but mushrooms don't have temper tantrums.
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