Specifics on the soil please. Nutrientless, some nutes, full of nutes?
Also, as an aside, don't leave the water droplets on the leaves while the lights are on. It'll act as a magnifying glass and literally burn the leaf.
And strain specific on the ER, they didn't yellow out on me until I hit flower, and that was probably my fault for not giving them enough food.
I'm very much pulling for you, as we are brothers of the first grow (lol). Don't beat yourself up over it, I killed my first attempt. At least you haven't committed infanticide yet.