Red diablo and rainbow loom advice
 

Looking for someone with experience with these two acros, my diablo is slowly turning yellow with red polyps is this from too high of lighting, having a similar situation with the rainbow loom, it is a solid yellowish green, just curious if this is a light intensity issue.

i guess it's possible that a lighting issue could be causing your color issues but in my experience the secret keeping acropora colored up is finding a nutrient & lighting balance.
to get the nitrate levels i want i test water often and dose potassium nitrate. my phosphate thus far has been easily controlled by my feeding schedule via auto feeder.

I have been doing the same with great results, I am dosing calcium nitrate though. I have noticed that some acros show different colors depending on lighting level and curious if this is the case with these two, and if so what color changes I could expect to see if I lower the lighting.