You can use tap water, but it may eventually clog the nozzles, I use RO water and have no issues.
I would also suggest that your 1st misting in the am be a little longer 3-5min.
Also can I ask why your lights are on 10-10. If the cham is in a dark room then it shouldnt matter much but if not they will prob be waking up alot earlier with the sun.