Discoloration spots on seedling leaves

I will give them less water, I usually only give them enough water to keep the soil moist but I will let it dry out a little and water with the Mist sprayer, will wait and see from there and give an update if there's any improvement on them just incase it could be the nutrient deficiency. I'm doing an outdoor grow, so I will bring try my best to maintain the PH but I'm not sure how to maintain the temp and moisture outside or should I bring them inside for a little till they reach the Veg phase?

Soil looks too wet. Let them dry out a bit. Allow your pot to feel light but without letting the plant wilt. Then you water modestly. Don't douche your soil, they don't like it. That seedling hasn't got a root system yet to take up all that water so where ever your roots push out they are pushing into water logged soil with no oxygen. Less is more early on man. Keep your temps and humidity in check, and your pH in your soil in range. And don't over water them.