Orange mushrooms melting

[Animal-Chin]

I have a rock of 30 or so bright orange mushrooms. 2 days ago one shrivelled and was oozing out this brown slime from its mouth. It dies, dissapeared completely. Yesterday 5 more did the same thing. I sucked them off the rock to try and end the cycle. This morning half the Rock is missing! Wtf is going on? Only change in the tank is different flow as my gyre died and I'm using regular power heads now but not near the shrooms.