SPS Issue

[Chad]

OK, lately I have been experiencing some weird SPS issues. The colours are dulling, there are white blotches (usualy away from the light). The blotches do not appear to be bleached. I have some red bugs that I recently treated. But not all corals that are affected had the red bugs. And mostly the dulling has been with the Acros' infested by the red bugs. But recently my Caps have really really dulled.. In fact an encrusting monti is almost completely dead and is having to regrow over itself.

My nitrates have recently spiked to around 20ppm from 0

What does phosphate damage look like?

The nitrate, I believe would simply brown out my corals.

Any suggestions would be much appreciated!

Thanks!!