I bought one of these from Walmart today for only 3 dollars so I felt like there was no reason to pass it up. Anyway, after doing a bit of research, I learned that the pebbles glued on top and the spongy soil it came with are both not very good for it. I've already peeled back the rocks, but what should be my next step? I should probably change to a different soil, but what kind of soil should it be? Also it has the large bulbous root that appears to be common to these. Should this be put under the soil? Thanks!