I have one tray (18 plant) of pepper seedlings that was overwatered while I was out of the house for a couple of days (long story--cardiac stent). They were left with wet feet for several days and some of the leaves have started to yellow. A few leaves have actually dropped. This particular tray has ALL my Sweet Pickles, Chili de Arbol, and Aji Dulce plants (6 each). So far, I've left the tray un-watered and under a fan for air circulation. My plan is to wait until they are completely dry before adding any water. Is there anything else I can do?
1/4 cup hydrogen peroxide to a gallon of water used for seed starting and watering until they're up and growing vigorously eliminates the worry of overwatering. It carries oxygen to the roots and kills any fungus that would harm them. You can also add water soluble fertilizer to it.
I used to have problems with damping off and killing houseplants because I overwatered. This has been my cure for years now.