you definitely need air in, if you can't get a fan just leave something open in the tent for a passive intake. try leave window open a tiny bit to let fresh in.
don't water to much while they are young.
feel the weight of the pot when watered then wait until they feel light then water but not completely dried out. as they grow increase the watering.
also i don't use nutes until they are established.
beautifull! well done :-) your v close. if you cant find a scope look for an amber tinge to the whole bud. or try a camera with macro setting and then inlarge the pic on pc.