grape caulerpa red grape caulerpa halimeda

Hey #reefsquad, I noticed my grape coral frag had some of this brown algae stuff growing on it. It doesn't seem to be getting any better so I was wondering what I should do??? Nervous that it will spread to neighboring torch corals so please help!! Thanks so much!!

I'm just getting rid of a lot of macro since it's growing alot this is for a mix this deal can get any better. Cheato caulerpa prolifera and fern some giant fern halimeda optunia some reds don't know what's under there most likely red razor red grape. Grape caulerpa first come first serve...