Halimeda is a good macro algae, if it is that I wouldnt worry about it at all. Macro can absorb some nitrates so its a win win, plus it looks cool, gives the tank some color and texture.
__________________ 180g- Mostly BIG fish and some coral. ~80g Nuvo- My coral tank with "happy fish"~ 90g- FOWLR Not the not happy type of fish~ 125g- Freshwater Malawi Cichlids ~10g- Nuvo- The refugees from the Ich of '18