thnaks for reply, heres answering your questions.

Lights at night not a option here.

yes we do ph/feed level rockwool for 24hrs before using.

our tap water is soft. presume by ppm you mean the feed wand? our levels dont show on wand with just tap water, (meter starts at 4) we make up to 18.

no we dont sit water for 24 hrs but will do from now on

dont use supplements, at a quick net scan cal mag plus comes in different strengths - what strength do you recommend?

currently grow with ionic grow ( black bottle) and flower with vega fleur ( 2 part liquid).

as we say any hints much appreciated

am downloading some of the hydroponics lessons to watch and hopefully learn a lot.