High phosphate but low nitrate

[Mattyice008]

So my problem is that I now have nearly undetectable nitrate, but steady higher levels of phosphate. I run a 66g system (sump and skimmer included). I decided to try and control the nitrate and phosphate with NoPox. I never used it before, so I have used it cautiously and set it up on a doser. Below are my graphs showing various parameters with a time line..i usually adjust the doser after reading the test results. As of now, everything is about where I want it except for phosphate, and magnesium is a little on the low side but that's a minor issue. Here are the graphs, follow the link to the page.

I was going to keep track of the iron/potassium/iodine more but after the first few tests everything was staying in good ranges, so I've stopped testing those as much, hence the only one test for those. However the iron was consistently very low.

https://reefapp.net/overview/share/ba43a9cc-a123-43f5-9f00-613fe515a8b3

(If it doesn't show automatically, set it to show graphs from Jan 2017 - June 2017)

Let me know what you guys think, I'm open to suggestions. Let me know if you need more info as well.

I began dosing NoPox in May, you'll notice the dramatic drop in nitrate..today it's currently set to dose a total of 4ml/day. All testing is done with red sea kits. I also have a reef-cam in the tank, if for some reason someone needs to look the tank lol, pm me for that info.

Thank you.

 

[Mattyice008]

I just read randys article in phosphate , I'm going out on a limb and saying that I'll probably need a source of phosphate exportation such as GFO. I'll check back in this later today

 

[Elegance Coral]

I would just run a little GFO to get the PO4 down to where you want it, then maintain it with your carbon dosing.