Lately, my tomato seedling's first leaves are beginning to look a bit curled up and are getting pale. However, the first true leaves have started to appear and I'm wondering if the seedlings will be okay. I have been consistently watering the seedlings, so I don't think they're dehydrated.

Looks like they are struggling in your pot soil, they don't look unhealthy, and will stall when they build roots. Looks like they are dry, and the light is not very strong. How consistent is the watering and how are you doing that, misting every hour? Bottom watering may not work for such small seedlings...they do need lots of light and water, but they could stand a bit of food as well, like fish emulsion at this age

kittriana said:Looks like they are struggling in your pot soil, they don't look unhealthy, and will stall when they build roots. Looks like they are dry, and the light is not very strong. How consistent is the watering and how are you doing that, misting every hour? Bottom watering may not work for such small seedlings...they do need lots of light and water, but they could stand a bit of food as well, like fish emulsion at this age

I gently sprinkle water from a water bottle twice a day; once in the morning and once in the evening. I bring the plants outside every morning and put them in a sunny spot so they can get their light and bring them in at sunset. I heard that people start feeding them a dilute fertilizer solution at this stage, so should I do that?

Too early to fertilize. They have no need for it right away.
Let them get a few leaves first.

Why are you bringing them in at night? I agree with Bill, they are to young to be fertilized. I also agree with kittriana, I would use a spray mister bottle and spray the soil well in the morning.
Are you planning to plant them in a garden when they get bigger?

Christine said:Why are you bringing them in at night? I agree with Bill, they are to young to be fertilized. I also agree with kittriana, I would use a spray mister bottle and spray the soil well in the morning.
Are you planning to plant them in a garden when they get bigger?

Yes, I am planning on planting them in the garden later on.

50* is a magic number for leaving tomatoes out all night, shield from winds and direct sun. Stockton SHOULD be warm enough for all night now, but you are light on watering, you might sit the pot in an inch of water today and let it soak up some moisture, then remove it to dry. They like water, but the bottom water will keep the top soil loose around the stem. Fish emulsion is such a very diluted form of fertilizer it would only help as tomatoes can be heavy feeders.