Purigen and Phosguard for lowering already low nitrate and phosphate levels

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I have had problems with Anthelia growing all over my 120 gallon mixed reef.

I have a good skimmer plus refugium. My nitrate levels are about 1 to 1.5 ppm by the Salifert test. My phosphate level tested about 2 or 3 notches above zero on the Merc phosphate test, I forget what the number is.

I am thinking of using Phosguard and Purigen as a trial to see if it improves the anthelia situation. My theory is the nitrate and phosphate levels are low because the anthelia and other soft corals absorb these nutrients right away. If anyone has been in a similar situation can they let me know. And if anyone has a good reason to use an alternate phosphate or nitrate reducing medium please let me know. I want to use the media in a bag rather than set up a phosphate reactor because of space limitations.