I hope others will jump in here as I have very limited experience with macro algae. But I recently started a display refugium and used a much warmer white light than I've used before. Two of the four macro algae didn't seem to like the warmer white. One had turned brown and looked almost dead so I moved it to my 65g shallow reef which has cool white with lots of blue spectrum. In just a few days it looked MUCH better. But the other 2 red algae are doing great with the warmer white. BTW, I have 2 leathers and a gorgonian in the display refugium too, and they are doing great as well. All 3 really extending polyps better than ever in the reef tank with cool white spectrum.