Q.Seed starting
When starting seeds indoors, I use a heating pad beneath the seed pods. When should the heating pad be removed? I do use Grow-Luxe once the seeds have sprouted.

Heat is generally only need during germination.
Check the seed packets to determine the required temperatures for germination.
https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/cheap-seed-starting-how-to-germinate-seeds-at-home.htm
https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/seedlings-after-germination.htm