Miracle-Gro All Purpose Compost
40% more nutrients than ordinary multi purpose compost
Feeds for up to 3 months

If this is the one you're using right now, adding fertilizers is not a good idea at all!
Usually this type of composts are not recommended with seedlings or very young plants. This compost has already high level of nutrients and you must be really careful with that. I used the same type of soil with my two plants from the seed, currently growing. But I was always giving only deionized water to them.

Let the soil dry out before watering. You have small plants in big pots. They can't drink all in two days IMO. Use distilled or deionized water if possible. If not, let the water from tap sit for a day.
Flushing with correct PH water also can be a good idea for now.
Do you have good drainage? Did you press the soil? These are also important.
Next time add some perlite in your compost. Or sth similar to help air/drainage.

Place your bulbs horizontal if possible, more light can be used by plants.

These are all i can tell. Hope these helps.
tevfik Reviewed by tevfik on . New grower n sure if serious or not - PICTURES First Timer 2plants slight yellow/light green on leaves Your Equipment: . 4 100w equivalent daylight bulbs . about 3 inch away from plants . 3 fans 2 blowing 1 extracting Rating: 5