Absolutely no coralline in the tank at all. I think it's because of the LED light spectrum, but even in the old setup it only grew where the sunlight came in (now in basement no windows). Kind of nice in that I can leave all that rock space for corals
Not the best picture but it gives you an idea. I have this colour purple over every inch of rock. I'm running LEDs but my assumption is that since I only have a few corals in the tank all the calcium from the salt is being consumed by coraline. Of course I could be completely wrong.