Dry Rock and long-term bacterial bloom

[Jaws]

Going through the same thing with my new 400G tank. Cloudy white and all the fish are suffering with pretty bad signs of what appears to be either ich or stress. Shouldn't be ich considering they were all in quarantine and treated with chloroquine phosphate for 3 months prior. Thanks for the tip about the UV. Hopefully that starts bringing them around. I also have about 50 pounds of live rock in a dark tank that I was hoping would help counter balance all the previous dry rock. All my dry rock was acid bathed before though so not sure why it's making the water cloudy after cycling for over two months.