Not reproduction...that is distress as you said.
Anyway I do keep some shrooms hairy, and rhodactis under halides but low to mid way through the tank.
Don't buffer alk or add calcium unless you test for them. This is probably your issue. I bet your alk is through the roof. Once I added (accidently) Some Superbuffer DKH that was in some topoff water to my fresh mixed saltwater, only a couple of teaspoons max, and had some of the craziest cacium precipitation I ever saw. Had to throw out the whole batch. I am willing to be your cal, alk, and mag are way out of whack and that is your shroom problem. Play with the light level though, as suggested. Unless you have a heavy calcium, alk, mag usage than you are probably getting all you need from your water changes and adding additional is ill advised.
Oh and do a big water change now.
Lisa