Can I add another clone to my grow?

I had an extra pot laying around, moved a couple fans around, and had enough space to put it in the cabinet. Should this be enough space for 2 plants, one grown LST(my current purple kush clone) and the other grown normally(the clone i'll be getting).
If this space gets the approval for 2 plants, I'll be getting a LED grow panel to place on the top of the cabinet for flowering and to allow for max growth height. I'll be using my current CFL setup for now until they reach height to switch to 12/12.

Probably going to be getting another Kush since that's what the local clinic usually has