Not sure if I can be of help, I also have a 12 site Undercurrent system doing bluedream under 6 1000 watts with a 1/4 hp chiller. Temps 76 to 79 degrees and water temp is at 70. Undercurrent advised me to go 1/2 strengh on the nutes thru out the whole grow due to the nutes will be overpowering...