The main reason your pepper plants are leggy is because they are not getting enough light. The second and lessor reason is because the soil is staying too warm. If you act very quickly you can probably save your plants by repotting them up to the bottom leaves in a deeper container.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.