hes a bit of a newbie!! he feeds the plants from the bottom thats why theres water in the bottom of the trays. we did a run off check and he put 7.2 ph water in and it came out 6.5 he hasnt fed in a while, he wants to know what cal-mag supplent he should get. the EC of the water was 0.6 before and the run of was 2.0 if that matters, i think he needs help and any advice or tips whats he doing wrong would help.