Just starting to flower now. Dropped the pH abit more the last 2 weeks as they did start to yellow they have now fully recovered from that and look a lush green again. Everything is as it should be. Lights out temperature could do with being a little higher than 18 degrees but they aint showing any problems with that so not worrying. They are now having 10ml per 20litre of flowering nutrients. Will gradually increase over the weeks and decrease the grow nutrients.