what is this?

[CrystalBaller]

Hi, the whole plant looks good except fo the bottom leavs that fell off. they are yellow and have black spots. is it over fert?

[dylan]

could be low N, the black could be mold, or it could be natural. if it's just the bottom leaves they could be just dieing as they get blocked from the light. they could be in too small of pots. i don't think it's overfert. please post somemore info if this does not help. you could go buy a soil test kit too, their cheap and could help alot.