It looks a lot like heat stress but from what your telling us it can't be heat stress. I left town for a month once and I had set up an auto watering for my soil mother plant. When I got back the auto watering thing I had set up had been working but, it had not given the plant enough water. Enough was given for the plant to stay alive, but it suffered damage that looked a lot like yours.

I would check the water lines to make sure that Sara is getting properly flooded and drained. Then move it 6 inches away from the light and put a small fan blowing directly on her. Then get some florakleen and flush like mad and give some fresh nutes. There could be a clump of hardened nutes in the hydroton, poisoning your plant. You need to dissolve it and flush it out.

Last thing i think it could be is damage to your main stem. Inspect it well, if you find something seal it up with some store bought stuff or superglue.

Good luck
SheCutEmDown Reviewed by SheCutEmDown on . what...is...happening? Ok I'll try to help as much as I can with info. Two girls: Tegan and Sara from cheap mexican schwag bagseeds Hydro, ebb/flow, 15 min flood every 2 hrs, aqua A&B, NPK 0-13-14 flowering 1000W HPS cool tube, 6" planters with hydroton clay pellets They will finish their third week of flowering tomorrow. Tegan has always been well and robust, but Sara looks like she is definitely hurting. Her flowers and most of her leaves have a very distinctive curling at the ends, the tips are brittle and Rating: 5