If you are misting your plants or foliar feeding, stop, it is not necessary.
Otherwise, some young plants just have spotty leaves for no reason at all and they usually stop as they get older.
Also, please, please go to 18/6 for the sake of your plants health!
All plants NEED sleep to finish their photosynthesis cycle and have a correctly functioning metabolism.
A plant with an incorrectly functioning metabolism will never grow properly or to its best potential.
The myth that it is ok to grow cannabis for weeks/months without sleep needs to be erased from history. It could only be recommended by people who don't understand photosynthesis or how plants function.
You will not lose anything by going to 18/6, in fact everything will be better, once your plants are getting the sleep they NEED and once they have a correctly functioning metabolism.
Hope this helps, Organoman.