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Alright guys so I'm in the later half of flowering stage under a 400 watt hps. temps are around 78 ph is between 6.5-7. The majority of the leaves in the top of the plant are curling under. I thought it was caused by nutrient lockout from the soil being too acidic, but checked ph and its where it should be. So any ideas on what causes curling of the leaves. I also feel like the buds are a little underdeveloped but it is primarily sativa so maybe its just that it need longer to mature than I thought. Any help is apprecaited.
If you're absolutely 100% positive it isn't pH then it looks like either WAY overwatered, or possibly some kind of lockout. My first instinct on that is definitely pH though... you might want to double and triple check it. and your watering solution pH, and runoff pH.