Seedlings sprout, but won't grow (picture attached)
This is my second set of seedlings that I've tried to get started this year with no luck. They sprout, then stay at the size in the photo for months. This has happened with my peppers (sweet and hot), eggplant and a few other varieties. Strangely enough, I didn't have this problem last year and everything is pretty much the same. The grow station is near the window and it's about 75-78 degrees at all times. The pots are in a tray and I water from the bottom once or twice a week. I make sure the soil is not too wet, only slightly moist to the touch. I've got no fungus, no bugs, nothing else I can see that's wrong.
As compared to last year's successful seedlings, it's the
*same grow light station
*same peat pots
*same Jiffy seedling mix
*same plant varieties
*same room temperature.
What the heck am I doing wrong this year???