I have had some of that for a couple years. It does spread. It has had die out/sexual events a few times. The first time i thought it died it got all clear and disintegrated but slowly came back and in new spots to. I run zeo and sometimes like when the stars and moon align i get low nutrient levels and my corals start to look good and some patches of this algae start to disintegrate. Those patches never came back. One rock (the origional one that got infested) got it back so bad i just moved it to the girls fowlr tank where it can be useful.
I tried picking at it and that helped but was a full time job.
I was thinking of cooking the rock as it is one of my favorites, but have not tried yet.
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