I have 6 plants about 2 weeks away from harvest and all of a sudden just 1 of them has yellow crispy tips near the buds, not on the fan leves but the leaves coming out of the buds starting from the top working down, I have heard heat stress but all other plants are fine even the taller ones that are closer to the light are fine its just one and another is begininng to do the same.....PLEASE HELP WITH AT LEAST SOME EDUCATED GUESSES....
That is possible but that usually starts from the bottom up on the fan leafs not the other way around. Also it would most likely be happening to all of the plants not just one. Again, pics would help!
check for spider mites too. I have seen plants that suffer from spider mites near the end of flowering and they start to get yellow tips on the leaves near the top buds and the actual buds themselves will start to turn yellow.