Agree 100% as im trying to remove all green disco shrooms from my system.Mushrooms are IMO harder to eradicate than aiptasia. I estimate that 40% of the real estate in my 29 gallon are red and green striped mushrooms. They constantly bud off and wind up anywhere, tucked in crevices or mixed with zoas.
I used to have finger leathers/toadstools in my first tank, but due to the slime factor and the desire to try more hard encrusting corals I'm holding off.
They release and land on corals killing whatever they touch.
They have killed small frags and did this to a stag. Fortunately it did not stn any more than what you see.
The shrooms are directly below.
It seems the more I remove the more I find or grow back.
Pic is with just room lights so you can see the damage.