Is this Dino's?

[Zoaelite]

I'm a little baffled, sounds like we have covered all of the bases. There are no excess nutrients in the water column so you should have no algae growth. I would say that your liverock is leaching something back into your tank but your tests are showing nothing. Your flow is perfect, your lights are good, your not over feeding and your running the correct filters.

Interesting... Any odd additives you are using that might result in it?