Could you take a photo for us to see? I look for droopy foliage, because that is one of the
things I cross for, so at 5 inches I do see a bit of a droop or the foliage beginning to bend downward rather than growing straight up. At around 18-24 inches I see or want to see a nice rounded arching of the foliage.
There are many different methods used, and it's pretty much what works best for each. I personally
do not continue watering with a peroxide solution after planting the seeds, but I do sterilize (heat) the soil before planting. Also, I use miracle grow as well after the plants have their second set of leaves. I'm trying more fertilizer on some plants this year just to experiment.
If I see a straight down droop of foliage, the plant is telling me it is in dire need of water. That's
happened a few times as I sometimes miss one getting enough water.