pls someone why did this happen?

2 indica plants not sure the exact strain. they are 2days from being 1 month old,
200 watts cfl in 6 gallon pots. dont know ph level. i did have flies and littlewhite bugs on one plant used some Bug B gone cleared up you can see the leave chewed up. but i dont think thatcaused it because i used it on 1 plant but both are like this. the light are18/6 but i left town last minutes from work and the lights stayed on for 3 dayswhen i returned they were not like that after 2 days they became like that. thesoil said enough nutrients for 6 months does that mean i dont have to put nutsor that does not apply to cannabis or is it a signs of low nutes? thank you in advasnce for ny help.

what type of soil are you using?

Looks like you had a little burn problem that resolved itself and some insect damage. But your plant is still doing well. The yellowing on the bottom fan leaves are not going to hurt anything. It's translocation of minerals from one area of the plant to another. When you feed, feed at the half rate. I think your soil looks plenty rich. A lime drench wouldn't hurt. Even if your soil is 6.8 which is the magic number you gotta strive for. If you want to try it the rate is 1tbsp/gal dolomite lime or garden lime. For the bugs you can get sticky traps or put perlite on top of the soil to deter gnats. Whiteflies you need to spray for. Safer soap. That's the brand name. Or anything with hot pepper will kill small bugs like that.