I have 6 plants 3 weeks old under 250W HPS with 4 30W CFL's at 6400K 2000 lumens each. So my room has 38,000 Lumens total. I'm growing from bagseed and using 2 gallons pots with 25% miracgle grow perlite and 75% miracle grow time release soil from Home Depot, I know people don't recommend this but it's my first grow.

The leaves are turning yellowish and the plants look like shit. I have a 2 X 235CFM fans, one for intake one the side blowing on the plants and one for exhaust out the top. The temperature is consistently 78-79 degrees while the light is on and probably 65 while off.

The light schedule is 18/6 on timers and the moisture in the soil is around 5 out of 10 (using home depot PH and moisture tester)

Is it better to water a little bit all the time or a bunch all at once?

Why are the leaves yellow, why are they sagging, and why does it look like once leaf wilted and dried up on one side?

I dont want to water too much and cause nute burn.