Sorry for the problems you had. I’ll be watching this post because I woke up at 3:30 am last month with a horrible dream about my horses. I woke up, ran to the living room flipped on the light, and they were fine. My water wasn’t though. It was cloudy. Almost milky cloudy. I turned on the actinic lighting and to my surprise there were thousands of little organisms just floating, and swimming thru the water. When I brought this up at the LFS, and pointed them out in his tank. He told me they were copepods. Made me feel good because I thought right off the bat "I can feed them to my fry". Geez, now I wonder if I don’t have another potential problem.
Will be watching/Good luck