Jon, Been running ecobak for over 4 weeks now. NO3 has been a steady 0.50. PO4 has been a steady 0.16-0.36. I'm listing a PO4 range because I honestly can't tell the differrence on the Red Sea test no matter how many times and in how many different lights, angles, etc - I will be replacing with a Hanna checker. I'm still seeing lots of hair algae which quickly grows and seems to be going through every shade of color. I've been keeping it down only through manual removal. A video of my reactor flow is linked below. I'm using a Maxijet 1200 through a BRS reactor. There doesnt seem to be enough flow to be moving all the media which I'm guessing is a problem. But I was sort of thinking that could be good initially since I have high PO4. Or do I not have enough NO3? Ecoback Reactor - YouTube Any advice would be greatly appreciated!