Hi, first grow, 3 master kush from seed, I'm in week 5 of 12/12 now, vegged for 6 weeks, running 400w hps all the way through in 900x900x1600 tent with extractor, lights off temp 16 or 17c, lights on 25 or 26c, keeping light 12 inch from closest bud, (only a few days ago was only 8 inch) in coco coir and feeding all gold label as per the guide on their site, watering to 20% ish run off and watering when feeling dry at top when I stick finger in, everything been going really well, much better than expected. But now the top bit od bud like 3 colas is looking bad, a bit small, a bit yellow, and the leaves are really short and curling down around it, but below that they're reaally healthyvan and every other cola (about 45 in total) is looking good too, what is causing this? I have uploaded some pics of the bad bits, other ok, bits and the whole thing, any help would be much apreciated, very new to this. Also should I defoliate a bit?
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