Pachira aquatica, Malabar Chestnut or a money tree doesn't really work well with most bonsai techniques. Big leaves, doesn't get much branching, etc. But fun to grow anyhow. I would at least take the glued rock off, make sure the soil drains and untie them. I have mine outside, they can take plenty of sun.
I rescued mine from someone that kept it in its original container still tied together, there were three trees tied together and only one with any life. I made a video of my process that I need to edit, when I am done I'll post the link here.