so i have 2 plants for my 2nd medical grow. and there both starting to have there leaf tips curl down and the sides of the leaf curl down. the temp on the top of plant is 72. no heat stress here. also have some pics so you can better see what im trying to explain. one of the pics have yellowish color on the edge, salt build up? also i misted my plant with some aza max about 5 days ago. my ph is a bit high at a 6.8. but im using a cheap 4 in 1 tester down know how accurate it is. need to pick a new one up. so yeah these are my theories, i just need a bit of help fellas.