Lighting Change

You should do a little research into DLI for your lighting during seedling/early veg. With a 240w light (if it's actually a true wattage rating) you should have plenty of light to not run a 24hr cycle. If you're really just entering your 1st week of veg, I don't think you're behind and you're not seeing the kind of stretching that suggest that you need more light. On the feeding, the seed itself has enough nutrition for the first week or so above ground after that, obviously in coco you'll need to make sure they're fed regularly and consistently. I assume since you're working in coco you've signed up here: https://www.cocoforcannabis.com/community/ It's really the best community/source of info.