Identify white spots on leaves please

One plant has white spots, other has light green spots...Plant with the light green spots has some very small holes on lower leaves...

Indoor grow...no nutes...4 weeks old





+ rep for any help

btw i searched for insects and couldnt find any...no spider mite webs (at least not yet) and didnt see anything flying around

Next time please only submit one thread in the correct forum category for assistance with any issues. Thanks.