I stopped using GH & AN due to the bio matter is leaves behind in my system. I'm a firm believer after 5+ years using RDWC that things need to be sterile as possible when going from a small DWC(less than 4 plant modules) to a more commercial RDWC setup. I've battled clear slime, random snot, root rot which all were nutrient related, not caused by temp or light leak issues. RDWC needs special attention due to the very high aeration of the solution. I got sick & tired of using H2o2 & all the shit that causes more problems than a solution. So, I made the switch to Cultured Solutions nutrients(no I'm not a spokesman for them), just a firm believer from actual experience with the nutrients. Some of the nutes are lightly colored but mix clear. If you're thinking of making a change, give them a try. They have an excellent nutrient calculator on their site that not only calculates ratios but tells you how much you're going to need for a whole cycle. Just follow the mix exactly. I have had no signs of any deficiencies as of yet. And I'm saving money. Here's some bud porn for proof. Keep'em frosty!