Indoor Seed Starts Follow-Up

I have been watering my seeds about every other day. The multi-celled containers dry out quickly, especially because I have the plant light shining directly on them for about 12 hours a day. So far everything has sprouted....

.....accept for the Anaheim chili and Australian brown onion. I am wondering if the temperature was not warm enough for these seeds or if the seeds were not healthy.

I am actually really surprised at how many seeds sprouted given the medium I used and the fact that the temperature I had them located was not very warm. I think the plant light I have is allowing them to get enough warmth. I may not need to purchase a warming mat after all.