Tomato seedling leaves turning yellow
I have noticed that the bottom 2 leaves(the first true leaves not cotyledons) of my tomato seedlings are turning yellow and dying. They still have 2 sets of upper leaves which are green. This isn't happening in all of them but a significant amount. I researched the issue and all I could find was that over watering must be the issue. I have not been over watering. I started them in small seed trays and planted them up in 3 inch peat pots. I bottom water them until the peat pot is wet and then don't water them again until the soil and pot is bone dry and some of the seedlings start to wilt just a little. Also growing eggplants and they are doing great! I did feed them all with a very dilute solution of a 2-8-4 fertilizer when they were potted up, which would be the half way point of them going into the garden.
Is this normal? if not, please advise.