I'm pretty sure that Prime Reef isn't an herbivore formula, specifically. It is more red not green (Formula 2 is the herbivore formula and is very green). My tank devours an entire cube of Prime Reef in the blink of an eye with my maroon clown heading up the pack! Of course these fish also do a number on the F2. Make sure that you're smushing the food up good for the tiny mouths. I try to make sure that I leave a variety of sizes in the food when I mush it but I have some big fish and some smaller ones.
If your fish are being fussy about what they eat try adding garlic to the food before feeding it to them. They might respond better to that.
My corals were definitely affected by the high nitrates in my tank. One of my Xenia melted down and my Kenya tree didn't like it either. It wouldn't come out but recovered nicely once I got the trates down. My 2 skunk cleaners have disappeared too.
I think it was the trates that did them in. The fish didn't miss a beat.
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