Many thanks for the encouragement. Still fine tuning. Will organise some sort of Oxygen bubble device also.
The reservoir is totally OTT @ (250ltrs). Didn't take into account that nutes need renewing at regular intervals so I'll probably only run max of 50/60ltrs at a time before refreshing. I will be using filtered rainwater +nutes for my girls nourishment. Tap water around here is ph8.5!.
Will try and suss out a growlog at some point.
Take care.......it's a jungle out there.