It's probably too cold for them at night or too big of a temperature gap between day and night. You said 65f, it's probably colder than that. I'd warm up the night hours to 70-72F if possible or try close that temperature gap to a 10-15f difference. This is exactly what happened to me sativas awhile last winter.Because they were asked fore, here are a couple pics that show the colors more accurately. Thanks again, all.
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Hmm, this is interesting. I might try this soon if the steps I've taken don't pan out the way I hope them to. Thanks for the input and to everyone else, also.Sounds like to me you need a little wood ash to help with the yellowing this is more than likely a nute lockout. Sativas are very finicky about being feed they don't need much if your soil is good. I believe that people have been using epsom salts way too much and it does build up in the soil easily. I am no super grower but have been growing things for decades and found early on the epsom salts usually end causing me more problems that it solves. The wood ash is a great soil admendment and with the sativas especially I find top dressing them with it and watering it in slowly greens up the plants nicely when suffering the discoloration yours are showing. Just my humble opinion but something to think about.