I don't know that you can do that. My mushrooms when they had broken of the rock they just float until the find a spot with less current and they atach themselves. You can put them in a container with some LR rubble and they will atach themselves also.
thanks, I will try the net. I have three mushrooms floating around, 2 red and one blue, I place them on a rock and they stay but at night when the lights turn off, the pepperdime shrimps knock them down