I've used seltzer water as a spray. I can't really say I noticed any difference in growth. Club soda generally has other stuff in it, like sodium, so I wouldn't use that. Make sure it's pure carbonated water.
dont ever spray your plants while flowering unless it is critical and its for emergency nute def or to kill bugs. it can/will cause budrot or mold or similar problems.
as of now yea it is. shes gets it from round 7 til it goes down (bout 5 rite now), so bout 10hrs of sunlight. im tryin 2 get my hands on a lamp to hang in my closet but funds r low.