2nd grow: Purple Lemonade Autoflower FastBuds Indoor

So, the problem is not yet fixed with the rusty spots on the leafs. The Purple Lemonade is the only plant out of my 3 in the tent that has this problem. Both GSC are completely, perfectly healthy. I only watered with CalMag and Silic Rock now, maybe she just needs less nutrients and the symptoms are slight burns. I'll further look into it. Besides that, the bud sites are really purpling up right now. She is still beautiful even with the yellowing leafs.