Looking out for falling mushrooms!

[nanmer]

I am having issues with some of my mushrooms, they have started peeling themselves off their rock and falling off. My tank has never been as well balanced as it is now and most of everything is doing really well. The green fuzzy shrooms are not doing this, just the flat metallic or flat greenish ones. Is this a normal way for them to populate my tank? Do they need more light? Are they not happy where they are? Am I required to stand on my head and hold my tongue just right to make them stick?