So I'm usually a bit of a black sheep with my methods of all things. Dosing my aquarium is probably no different. I'll be setting up an industrial diaphragm pump to continuously dose my macro nutrients. (I'll still be doing the iron & micros manually) This combined with my constant tap-water drip instead of doing water changes should allow me to keep a fairly constant level of nutrients in the water at all times. So assuming a standard 30ppm of CO2 in the water what should the levels be for N, P, K, & Fe?