Canna Coco is a full media + nutes system and IMO you should run it as a system instead of trying to reinvent the wheel. Also, coco is a system where you need to be able to test your pH. How do you know your pH if you don't have a meter? You posted it earlier... Get some liquid indicator asap.
You absolutely need an exhaust. Turn your intake fan to an active exhaust and place it high in the room. I hope it's a good sized one?