Why are my leaves turning this color?

Looks like a small over watering, and it needs more nitrogen, and CalMag

Plant looks very hungry. Lots of deficiency signs. Normally it would be a sign of ph out of range in substrate. I would check next run off just to know. Increased feed if run off is in range. NPK ratio for vegging is 3-1-2. NPK ratio for flowering is 1-2-3. Add more course perlite or coco coir in future grows. Perlite Will improve drainage, both provide more air to roots which is very important for the plant in general. Also both improve resistance to overwatering greatly. Like minimum 30 percent instead of 5 percent. Would be a recommendation as well. Your substrate mix will dictate how big, and speed of growth that can happen as well. Good luck and happy growing 🌱🌱🌱

You need way more potassium there too. That’s not a good NPK ratio. For veg you’d want something more like 4-2-6.

Thats def nitrogen and few other defficiencys . She's just hungry and thirsty . Feed her up quick buddy