yellow leaves on bottom

2 small leaves on the bottom of my plants are turning yellow. can someone tell me why? im using no nutes and the lights have been on 24/0 from start

How old are the plants?

just pruned my bottoms today. yellowing bottom leaves are normal after a while. mine always yellow in perfect order from the bottom without skipping a beat.

Its probably a lack of nitrogen... What/when are you feeding your plants and how old are they?

they are 3 weeks old and im currently just giving them waterr

They have the munchies....

3 weeks is young. give em a little snack.