Always feed coco every day. You can get lazy here and there but the best practice is daily feeding. Feed too run off as well. It’s virtually impossible too over feed coco. The only way this would happen is if you had your nutrient mix made up too strong. What nutes are you running? Calmag is important as it boosts the plants ability to take in more nutrient. I would suggest running the light on 18/6 but that’s my preference too auto growing and tbh I haven’t grown an auto in a long time so I may be off the mark with that one.
Oh, and dude, she’s a month old. She’s doing fine.