I'd say that's a good start... I wouldn't neccessarily reccomend a PhosBan reactor at this point, I think I'd wait til you confirm you have a major PO4
issue first. Invest in an Aquarium Pharmaceuticals PO4
test kit, i'm not sure on overall accuracy, but it's pretty simple to read. Do this before you go nuts on the reactor.
note: I use phosban in a fine mesh bag (comes with phosban jar) tightly rolled up and with another mesh bag filled with carbon wrapped tightly around it, then rubber bands are wound around them to keep it all together. This equates to low phosban flow and no cloudiness, all without a reactor.