Depending on how big your mushroom is. You can use a sharp scissors or an excto knife and just cut it in half. They tend to slime allot so superglue is a bad option. I would just cut the mushroom in half or quarters and place them in a tupperware container with rubble rock. I would then place some bridle vail over the top of the tupperware so the 'room don't float away and place in a low flow area of your tank untill the mushroom attaches to the rubble. That's it... Have fun...