so I just started dosing NOPOX, I do half of the recommended dose since my nitrates are 0 and my phosphates are undetectable. I run chemipure blue and purigen in my filter. should I stop using them? and is it ok to just run gfo or carbon if i take the chemipure and purigen out?. I do have a bit of this brown algea on my back wall and im not sure if its just dying green hair algea or something worse. I have noticed since dosing the nopox its been reducing slightly. also what are some good test kits for a reef aquarium. im using the API one and im afarid im getting bad results with it.