Interesting just some thoughts
1 Toxins leaching out for tank..not likely as he does 80 gal/wk water changes
2 Infection...maybe even with the UV on...he states that he has progressively losing corals ( most fragile to least lps's. UV could upset the bacterial balance in a zeo system??
3. Something in the water(DI/RO???) or salt..maybe
4 Zeo crash...maybe...mineral imbalance?
5. Did you check orp?
6. Nitrates in the tank...not unless he has stirred up the sand
7. Some thing is releasing toxins in the tank...algae bloom maybe. Toxins are not usually destroyed by UV and only paritlly skiimmed out.
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