Need Help with High Phosphates

[LeanneP]

I have a Remora Aqua C skimmer that is about 6 months old. Fish are sailfin tang, rabbit fish, 3 damsels, 2 clowns and a lawn mower Benny. I did add some GFO earlier today and my hammer coral is already looking a bit better. I used Fluval brand which I am sure is not that great but it is what I had. I used the most minimum amount that they suggested to avoid bleaching.
I have just retested my nitrate with two kits and they both say 0 for nitrate but they are API and I know they are quite inaccurate. I have a Nutrfin test kit for phosphate, again it is saying 1.0. I know I need to invest in some better test kits. We don't have any stores that sell decent ones here so it is on my list for my next trip to Vancouver.
I know that I am having these issues because of the water quality so I hopeful now I have R/O water things will get back on track. I do have a TDS meter so I check all my water to make sure it is at 0 before I put it in the tank.
Thanks for all the help. I will try and find some better GFO tomorrow.
Leanne