Good guess Hamwild. It is a Huernia schnideriana, or seedling of such. That is a very well grown plant. Tell us you secret and soil type. I could never grow mine that well. And yes it would need transplanted soon. I think the sooner the better. Watch you don't break it apart or disturb the roots.
I can't give you any advise with growing after you showed us your skills on this one.