Hoping an experienced reefer can drop by and help me out

[Javed Aman]

So I've been struggling with dinos and other issues with my tank for months now. My thread is here:

And the reef2eef threads are here:
https://www.reef2reef.com/threads/toxin-in-tank-corals-dying-fish-dead.818588/

https://www.reef2reef.com/threads/months-of-struggles-high-res-pictures-sorry-long.809314/

 

 

I bought a UV sterilizer a week ago and have been using it on and off for a few days (for about an hour). I always noticed the corals would close whenever I ran it, so I kept it short. Yesterday I let it run for most of the day and the entirety of the night. During the day the corals seemed fine. This morning, All of the remaining corals closed up and the last two fish are breathing very heavy. The clownfish is listless and letting the pumps blow it around. I did check for stray voltage with the uv on using my multimeter. Without the UV the tank has 0.08V, with the UV it goes up to 0.11V I think both are pretty low to be any concern. 

I've tried everything (it's all mentioned in the threads I posted). I was hoping someone could drop by and help me see if I'm missing anything. This has been going on for months and just been getting progressively worse. The aquarium is at my parents house, both are fully vaccinated and I have my first dose. I don't know if this is a strange request, but I don't know what else to try.