Hey all. I had undetectable or bareley detectable nitrates for over a year in this tank. I started dosing sodium nitrate and getting that dialed in. I'm at 2.2 from a high of 5.2 (using a Hanna checker) in 2 days without dosing. I was dosing 20ml of my solution to get it up so I'm going to try 10ml daily and see if I can keep it stable. Now on to the phosphates which were at. 22 yesterday. I added 10 tbl spoons of gfo (brs bulk stuff) in a reactor yesterday. It's at a nice slow tumble. Water volume is around 40 gal total. Today PO4 is showing 0 on my Hanna checker after only running gfo for 24 hours. It's not the ultra low checker. Is it possible the gfo removed that much phosphate in that short of time? If so should I pull it and just keep testing to see how fast it rises then try to dial in an amount of gfo to run. What I'm trying to accomplish is a sps dominant tank so I know stability is key and all my other parameters are good and stable. With the super low nitrates frags were doing hohum. Not dying but not thriving either thats why I started dosing the sodium Nitrate. Rocks are covered in hair algae which I believe is from the high phosphate and also I believe . 22 is high for corals also. Just trying to put together a game plan here and not kill everything except the hair alage. I do like to keep things as simple as possible and am not a big number chaser. Just want a nice stable environment to grow out all my frags. I only have 2 fish in the tank but do feed frozen mysis and frozen LRS reef frenzy twice a day with the return off so the LPS in there get fed also. Any input frome those of you with more experienced than myself?