We have some aggressively spreading fuzzy mushrooms that are encroaching on other (more desireable) corals we'd like to keep happy. I have tried cutting these things off the rock before, only to have a new happy, healthy mushroom appear where the tiniest invisible trace must have remained behind.

I am considering a thick kalk paste spread on top of the mushrooms in the most offensive positions, however I am wondering if this will just destroy our water quality... (or would it be ok if we were quick to clean up the dieoff?)

What's your favorite method of eradicating an unwanted coral? Any suggestions are appreciated!