I have a small amount of phosphates in my reef tank, and I cant figure out where they are coming from. I think I am getting them from something I am putting in but I use quality stuff so I thought I would post and ask if anyone knows anything about these products having phosphates in them. I have a reactor but I need to change the media, which I will be doing soon but, I still would like to get to the root of the problem. Here we go, I use Red Sea Salt, Hikari frozen brine and mysis, Kent Chromamax, Kent Lugols, TLF C- balance, TLF Marine Snow, TLF Kalkwasser, Seachem Prime, Aquavitro Fuel, Aquavitro Ions, Aquavitro 8.4, and TLF Phosban. I think thats everything. Im also using a BRS 5 Stage RO/DI unit but dont have any phosphates in my tap water to start with. I wonder if the Phosban in the reactor could be releasing phosphates back into the system? This is a 100 gal tank with 150lbs of live rock. I have a wet/dry on it put no bio balls, the water just circulates through the empty wet/dry. I dont have any algae in the tank and the corals look pretty good. How do you use this chaeto stuff? Does it need a light to survive and could I use that in the wet/dry? Anyone have any ideas?