Ok, here's a couple thoughts from the pics and your bit of write up at the begining.
First, they look a little stretching to me, but I don't know what plants look like growing under hps cause I do CFL. But I like to see the cotes right down just above the soil, not several inches. These could be sativa too, I don't know what blueberry is, and I'm too lazy at the moment to find out
If it's sativa, then it'll grow lanky so just keep it in mind over your grow.
You'll want to start thinking about how to LST them now, not later. They look like they could end up tall so get planning now.
Get that tv hooked up for them, they'll grow much better with daily doses of gerry springer and reruns of Master of the Universe.
Is that a garden probe pH meter? Take it outside and throw it. As far as you can. Preferably in a direction away from human populations. Get on amazn and get a pH testing pen. It's worth the 10-20$ for one just in the amount of headaches you'll avoid.
Those sheets and pillows or whatever that stuff is, if it's not made out of hemp, you'll want to remove it from the area. Cannabis plants are known to hermie when they're in close proximity to man made fibers or that inferior cotton. If that's real silk, get rid of it right away, your plants will look at that, and go back into perpetual veg trying to get fibers so fine. Now you know where industrial hemp came from.
And with five plants, you're going to need a much bigger table.
Otherwise,
Over the next week or so as you bump em up to full nutes, you'll see the color richen and you'll want to closely observe how they grow. And I'm talking internode length, numbers of branches etc. This will all be important as you train them, and will be very helpful in future grows so you can manage the growth better. Unless you're just going to grow verticle plants, then life is much simpler ;3