I need to do a little more reading on P def and lockout, you mentioned this once before. I do test the run off and Ph going in is 5.8/out 6.0. The TDS is usually a little higher coming out than going in, around 300-400us/cm. As far as I can work out, staying within a 200-300us/cm range of nutes coming out is preferable. I have increased the bloom nutes lately and today I notice the purple stem is slowly turning green, from the main stem outwards. Maybe she wasn't being fed enough. It's difficult to work out exactly how much I should feed coz my tap water is a high EC, so following nute advice is difficult. I'm keeping a note of the nute schedule and will hopefully crack it on my second grow. Many thanks for your advice, appreciated