Don't dose Prime, it doesn't work to bind or remove ammonia as advertised (though it is a good dechlorinator, if ever needed). Here's the testing that was done on this:
Summary (the whole thing in one paragraph) ClorAm-X is the best-performing of a barely effective product concept. Under the label usage ClorAm-X (but not Prime, or other common products) can be measured to lower the amount of total ammonia in a saltwater sample. This process is slow...
www.reef2reef.com
Many test kits will seemingly always report about 0.25 ppm ammonia when the concentration is likely much lower. I would consider this to be basically zero for ammonia. Even if the concentration really is 0.25 ppm, that's not toxic or anything to worry about. Corals can actually uptake and use ammonia in the water, so it may be a benefit. Here's a write up by RHF on ammonia toxicity:
Ammonia is Our Friend By Randy Holmes-Farley Yes, I know the title is provocative, and likely goes against much of what you read and hear in the reef aquarium hobby. I believe, however, that the hobby may have been harmed by the continual...
www.reef2reef.com
From the above link, RHF writes:
"4. Toxic levels of ammonia are just not reached in typical operating reef aquaria. Seeing a measured value of 0.2 ppm, whether real or test error, is not a concern. It may be a benefit."
Fro the first pic you posted above, the surface of your water seems a little flat, like there's not much for circulation, which is important for good gas exchange. You want the surface water to be turbulent by pointing a return line or circ pump up at the surface.
I believe that the addition of the new Nero circulation pump is going to help here. You have either a bacterial bloom, or possibly an algae bloom, though healthy algae will be green, whereas cloudy water typically points to bacteria.
I would see what happens in a couple of days or so after the new Nero pump has been running.
I hope that helps, please let us know how you're doing!
