Those look pretty decent, is that just one plant, or three? What are you lighting them with? If you don't have HID yet, think about buying one within the next week for amazing growth rates.

For veg, after 4-5 weeks you should be fine switching to flower.

As far as the miracle grow, don't do that. You'd be better off buying the cheap topsoil they sell at home depot (outside in the garden area, even in the winter). You'd be likely to find something acceptable at a local greenhouse, though. Look in the yellow pages.

Keep up the great work and keep an eye out for problems. :thumbsup: