Should I put the whole flat under lights now? Should I take out of flats when they get a little bigger and put in individual pots?

How often should I water under the lights? Should I keep moist or wait until it dries out a little as I do for my maters.

I've never heard of strawberries from seed, so being the curious sort I had to look them up. You probably know they are biennial and don't produce many stringers.

I would put the whole flat under lights now and transplant them into individual containers when they get their second leaves. Don't leave them too long or their roots will really be enmeshed. If you have trouble getting them apart then soak the dirt off the roots and they will come apart.

You must treat all plants like you do your tomatoes. There's not one flower, vegetable or fruit that I know of that you keep constantly wet. When soil is waterlogged it sets up an environment for disease, the roots stay on top, all the microscopic air pockets are filled with water. You have a weak plant that is likely to die.

When you wait until the plant is dry, Your plant gets a good root system because the plant makes more roots so it can search out moisture, and those little air pockets are vital to a plant's growth. You have a health plant.

Mike

Soaking the mix every 5-6 days is letting them dry out, Maybe not as much as you do tomatoes but dry out never-the-less

Not quite true. The mix is only about 1", maybe 1.5" deep. I soak them, to the point water is visible on the top. They do not sit on a heat mat nor have a fan blowing on them. I'm not saying they need to sit in water, only stay more moist than most seedlings do.

YMMV,

Mike