Potting soil is sterile - might not have as many nutrients as some plants need. So keep that in mind. Plus depending on where you got it, it could have Milestone in it.
I've had better luck with seedlings and my aloe (and the rosemary I was attempting to overwinter inside, *sigh*) using a homemade mixture of compost, peat moss and perlite. I just mix it up in a Home Depot bucket until I like the consistency, and there you go.
I got some sickly purple-colored aloe from a friend (she'd neglected it for quite a while), planted it in my mixture, watered once a week if that, and now I've got 8-9 little shoots/plants from the original 3 sad, purple ones. They're just on my north-facing kitchen windowsill, and I kinda space on watering it. My grandma used to keep hers on a south-facing windowsill in the garage, and her aloe plants were huge suckers that were probably 40yo by the time she died.