I've been testing for Phosphates, which have been higher than supposed to be (.18 last weekend and .12 this weekend). I have significantly reduced feeding pellet foods. Would you suggest a GFO reactor to further reduce phosphates? If so, which media reactor would you recommend? I have the RedSea 750XXL (200 gallon with Sump). Only running chaeto and Protein Skimmer in Sump besides filter socks. Thoughts?