I am currently running a Reefmat in my tanks over filter socks. I have noticed high levels of phosphates (over 1 ppm possibly closer to 3ppm based on the Selifert test) and was dosing Phosphat-E to help lower them. I have been putting 5ML in the reefmat once a day. Based on what I am seeing with the Selifert test, it appears to have lowered the levels some, but they are still high. Is the reefmat the proper location to be dosing it or should I put putting it directly into the skimmer?