Please help, NL B&Q soil watered twice a week, light fan on them and mid 70s temp, i have not added any nutes at all, whats wrong ?
How old is the plant? Not familiar with NL B&Q soil. Does it have any nutrients in it? Have you tested your runoff pH?
3weeks old NL is the strain Northern lights, haven't checked PH run off, perhaps I should. B&Q soil is just multipurpose.
That looks like stress from water getting on the leaves while lights were on, don't spray it if you are while lights shine. Let your soil dry out more if you can; it could be from guttation. You should transplant up if you can, into a soil mix of 50% potting soil 50% perlite, packed down as much as you can into the pot. You don't have to worry about too much compaction because of all the perlite, so get as much volume in there as possible.