Thank you for the advice GrowingGrannie, I had no idea these were auto's & thought my lack of growing skills were the reason they were so short.
A good pH metre will have to wait until next month im afraid, let's hope I can 'wing it' until then !
I've taken on board im feeding to heavily & hadn't realised the plants could all look so different & still be the same.
They are supposed to be sativa dominant & just feminised ( not autoflower)which is where some of my confusion ensued.