I read the sticky, but can't see how it can be a PH or deficiency or ... and only affect two of the plants.

Soil was mix of seedling starter and Supersoil. Water every 2-3 days. 24 hour light. Humidity is low and temp is warmer than optimum. Good air recirculation.

Pots are 5" (1 quart) and may need to be repotted soon, but if that was the problem, wouldn't the larger plants show root stress first?

Lights are 3 each 15 watt LED spotlights and 2 cool blue and 1 warm 26 watt CFLS. They are about 4-5" above the plants. Again, if it was light burn, the taller ones should exhibit stress first as I just raised the smaller ones.

The two larger are about 8" and the smaller ones are about 6" tall.

Can't do pics now, but may try later.
RackitMan Reviewed by RackitMan on . Leaves Yellowing? It is just about impossible to troubleshoot as I have four plants in identical soil, from the same seeds, same size pots, same watering schedule, same lights and environment, etc. Two are bushy and nice and green and two are much smaller with yellowing, but not sagging or curling, leaves. The smaller ones are propped up to almost the same height as the larger ones. They are 3.5 weeks old and received one weak fert treatment in water. Any thoughts? Rating: 5