[Floyd R Turbo]

Sounds like it's competing with the tank algae, what's your DT lighting type, intensity, schedule, etc?

Do you have a lot of corals?

What are your water params?

Offhand I would say, intensity is OK but with the DT competition, you might not be able to push it much harder based on that growth color. But, you should be able to extend hours. I would go to 16 or 18, same intensity (4)

Then I would consider adjusting the DT lights in some fashion, this will depend on corals, but essentially making is less algae-friendly by backing them off somehow, and let the scrubber out-compete it. Make a small change for a start and see if that shifts growth to the scrubber. Don't make a huge change, that can shock the system. Just a test and observe results (10-20% reduction, etc). If it seems like that makes a difference, then up the scrubber intensity and flow a bit and observe, then continue down that path.