What is happening to my SPS colony? Can't tell if changing color or at death's door..

Well, two more beautifully encrusted frags are showing the dreaded white spot of death on the encrusting which means they WILL be dead within 2 weeks. I ripped one off the rocks and dipped it in bayer and coralRX; no signs of flatworms. Of course the shock killed it within 2 hours but I figured it was dead anyway.

I am at wits end, I am about to start doing some MAJOR drastic changes knowing full well I am going to wipe out $1000's of dollars of corals intentionally JUST so I can figure out this fking problem. It makes me literally insane not knowing what a problem is when it goes bad.

I thought maybe nutrients are too low but my rocks have LOTS of green algae on them that I have to blow off daily (20 min process alone). My back glass gets covered in algae in one day so it's not nutrients.

I have no way to tell if it's lights, don't know if I have too much or too little because the coral death is so random.

Looking at my tank it seems all colors are just so faded and bland. I have been feeding and feeding and feeding some more. I am over $150/month in coral food alone. Every single day some random coral starts the death process and I don't care what ANYONE says, once SPS show signs of tissue loss or loss of PE they are done.

FOWLR tank here I come. :(

Time to turn into a mad scientists and see if I can make drastic changes to my corals and document the effects.

Edit: Experiment #1:

Shutting off my lights for 48 hours to see what my SPS look like after.
 
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Have you stopped carbon dosing? I had some pale corals before when i was carbon dosing. I stopped, added a few fish and started adding reefroids a few times a week during feedings to boost my nutrients. It worked really well, the colors came back fairly quickly.
Any excessive sliming at the tips?
 
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