Hello,
Yes I'd suspect all the algae is consumption the phosphate. Much like an equalibrium state if you want to think in terms of chemistry. I also suggest removing as much algae as you can off the corals so they won't be out grown. I don't know but maybe you can also take some snapshots of how much stuff your skimmer is pulling out, and perhaps even get a loaner skimmer off someone.
Titus
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