How bad is it exactly? If you're phosphate is that low and you have chaeto I imagine just manually removing it will do the trick.
The chaeto is the "king of the garden" but you still need to remove weeds from time to time. Eventually that maintenance will be become less and less because you're allowing the chaeto to hog the nutrients and the other algae won't have much of a chance.
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160 mixed reef: Hippo tang, Foxface, clownfish, 25+ nano gobies/blennies/cardinals
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