Hi, and thanks for the advice, I found the problem However, it have been using Canna vega during the veg period, when mixed up with the water this feed retained a PH 6,5-7, However when I started the 12/12 I switched to Canna Flora and foolishly asumed that the PH would be correct, however after checking I found that the PH of the Flora feed when mixed was PH 3.5-4! so lesson learned, I flushed the soil with balanced water then fed with a Feed of PH 9, this brought up the PH of the soil nicely, I checked the run off after a few feeds and things are now balanced again! And I have noticed a that the buds have really taken off, I lost quite a few of the older leaves but to be honest they were so bushy before that a lot of the buds were getting no light, so its not a bad thing. All in all they have grown about 8-10 inches in the last week, and I have counted 26 buds on 1 plant, 23 and 27 on each of the others, the biggest being around 8 inches long, so hopefully and I reckon around another 4 weeks, I should get some first class smoke!, I will try to post a few pics when I get chance.