Is there a requirement for how many hours a tank needs of mostly dark? I have my timer set from 11am to 10:30pm, so 11.5 hours. My only concern is from about 7am when the sun comes up until the display turns on, it is receiving 4 hours of natural light before my 11.5 hours of aritifical. So is 15.5 hours of total light per day to much? Does the tank need more than 8 hours of dark or is this ok? I know about replicating natural light so I would assume 12/12 but I know most parts of ocean is more 14/10. Any input would be appreciated.