Aqua farmin

[Dig]

Hi everyone im struggling a little bit with how often to water my aqua farms, never sure weather am under/over watering them. Cocked it up twice now and cant seem to find a happy medium! P.h and e.c always all over the shop, temps bang, humidity fine, got loads of air exchange but they look lousy! Has any one got any expertise on this? Id really appreciate any advice or help. Many thanks