My buddy was getting out of the hobby and I got a lot of cheap coral from him. Some of the frags have this on them... Looks like calupera maybe?
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Sure its going away? If your system runs very low on nutrients it will kill it off, if its Caulerpa.
but if its Bryopsis, thats a different story. Keep an eye on it, real close.
I had one frag come to me with a little Bryopsis. I manually pulled it off and then completely covered the area in super glue gel. Never has come back (knock on wood) and it's been about 9 months.