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mushrooms will detach if they don't like where they are located: too much/too little light, too much/too little current...possibly due to crowding (don't know, mine never fill in a space enough to look crowded)
Mine fall off when they get too crowded. I give too friends who have saltwater tanks. I add Kent`s Coral accel for my mushrooms, Malkore. They grow like Crazy. Have a good day
My medium sized rock is covered in mushrooms. They cover each other all the time and never move. As malkore said they will relocate if the lighting isn't right. They will definately relocate if they have flow on them. A little flow is fine.
Just pick up the lost mushroom and stick him in a crevice of some LR. If they like it there, they may attach in a day, but sometimes it takes 2 weeks.