Welcome to the boards Adambomb, Great first post!:thumbsup:
It looks to me that your over watering and because the medium your using has nute's already, there's no real need to add more. Especially since your plants still small yet.

Your watering correctly by having some runoff, but try only watering when the pot itself feels very light weight.
I over watered my 2 weeks old's recently, and let them dry out for 8 days before I re watered them. They look great now.

Great video Adambomb, that really helped. Good luck to you on your grow.