Silly question

I know people have gone over this a lot, but what type of soil is best for indoor cultivation? I've seen a lot of "recipies" for good soil, but I don't know where to purchase said items, is there any potting mix that is good for growing straight out of the bag? I bought a big bag of worm castings (I'm going to mix in 1 handful for every 6" pot). Please help me out with this I'm currently using MG moisture control soil, but the soil gets really compact after a watering, then the soil takes like a week to dry out, in which time I'm wondering if I should water again. I've had my little seedling under a 430 watt hps son agro and two t5 (at a safe distance don't worry no heat problems) and after about a week and a half it's only grown about 2". That's bad right?

Lots of people here LOVE the Fox Farms soils, but usually want it mixed with some perlite/vermiculite for better drainage. I've seen recommended between 25%-30% perlite-to-soil, and that's about what I use. I'm using Gardner & Bloome soil, seems to be pretty close to FF, but at a better price. This is my plug for going ORGANIC, too, if'n ya can.

Oh, and don't worry too much about growth rate right now. People get too hung up in whose plants are growing faster. You want the Dankness, be concerned with that, and not killing the plant.

If i get stuck for organic soil off my local supplier, i often use Wests Advanced +, its quite loamy, and doesnt compact like some composts, also its texture and make up aids root development and is easier for the roots to grow through.
It has good water retention without leaving it soaked through, and is generally good for 5-6wks of growth without the need to add any nutes,also it has pretty stable nute levels and is not too hot for marijuana...I grow 12/12 from seed and the compost sees them thru to flower every time.

Frosty, is that a locally produced soil? One of the reasons why I went with the Gardner & Bloome is that it's produced relatively nearby. Plus, it's already dosed with mycorrhizae.

Yeah Sea, its from a local farm that composts its waste material each yr after the fall harvest... they mulch the waste vegetable matter and manures etc and create huge great frickin mounds of compost, then they use the farm machinery to 'turn' the compost regularly so it all matures at the same rate, and each mound is pretty much left for around 2yrs.
They do sell the stuff each yr as it becomes ready for use, but they use 80% of it to fertilise their fields ready for the next crops, which i think is amazing.