Yellow and fragile leaves 2 week

You're overfeeding them... autoflowers don't like any nutes for the first week or two so give her just plain pH'd water for the next week. When you introduce nutes to autoflowers, you need to do it slowly and start out with 1/4 to 1/2 strength to see how they are tolerated. This is NOT a magnesium or a nitrogen deficiency, it is NOT light burn (stop spraying the leaves or you WILL get light burn - if you ever have to spray leaves, do it just before lights out). The leaves that are curling up on the edges are telling you it's a little too hot for them... do you have fans going in the tent? Stop feeding them and get the temps down a bit.... everything will be fine. Good luck!