the brownish and yellow could be a manganese deficiency, what ppm is the water before u add anything 2 it?my guess is u need cal-mag.if u have to 2 micro nute deff's,there is a good chance you dont have it available in your water.or,your ph's are off and both of those elemts are being locked out,causing problems.i know this sounds stupid but u are testing your ph after u add nutes right? maybe buy a super cheap ph test kit from a hydro store for like $5.00 and compare it to your meter.