I personally think it is you P04. Zoas love nutrients. I was running GFO and striped my water of P04 and Zoas shrunk and started to recede. Took a week or so to get nutrients back up and took 2-3 three weeks for Zoas to recover.
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It depends on whether that frozen food has phosphate in it or not. More pellets won't help, they are very low/no phosphate.
The way I found out my frozen had phosphate is I thawed a cube in a couple of ounces of RODI then just tested that water... Was pretty high in that concentration.
Uh ok, can I say I'm more confused now LOL...
The only thing I'm worried about is that I see some red slime starting to form in a few places, I hope the feeding increase doesn't have a negative effect on that.
I totally agree with that, I changed my LED yesterday so that's already in effect.Change one thing at a time. As most have suggested your lighting is likely the culprit. Adjust it and give it time. If that doesn't help within a reasonable amount of time, then look elsewhere else such as your chemistry.
If you change too many variables at once you're going to drive yourself crazy.
I totally agree with that, I changed my LED yesterday so that's already in effect.
@CodyRVA I was not saying that pellets weren't nutrient dense, I was only speaking specifically of phosphate. I agree that increased use of pellet foods will definitely increase available nitrogen as they are broken down. But it's been my experience that pellets contribute very little (if any) phosphate (specifically) to the water. Since the OP is already measuring 4ppm of Nitrate in their tank, nitrate is probably not the issue. But the OP was asking about phosphate and I was simply providing what I knew from my experience.This is false. Pellets/flake foods are much more nutrient dense than frozen foods. If you're trying to "dirty up" your water... You'll want to use pellets not frozen. Not to say all frozen foods are as clean as others, LRS is a very clean product IMO, but I don't know of any frozen food denser with nutrients than a pellet food.
If you tested and got low results with pellets its likely Bc they didn't have time to break down.
If you look at your original pic there is a "spot light" effect, I would say physically raise it higher.
I have no experience of this light, you said you can't do the above, can you get wide angle lenses for it?
Do you have an fts please?