You cut the pot down to size? Good job but I'd have probably (quickly and gently) removed plant and added soil to bottom, but I'm sure height restraints prevents this, right?
-But-
Is that a plastic disc to reflect the light back up? How do the roots get air?
Pushing some (3 or 4) small bamboo stakes into pot, (so that they are at least an inch or two above the edge of the pot) and resting the disc on them, might be a better option, if you must, but keep in mind that the roots need decent air circulation.

HTH...Rusty

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Rusty's Bonsai Re-Vegging
CanCom Troubleshooting Forms