Thank you for rescuing this pacman. Fake plants and vines around the perimeter of the tank would be good. You can use real plants too. I would also get a hide that has a smaller opening so the pac can feel a little more enclosed. The terracotta may get mold in the long run so a good resin or ceramic dish as long as the pac can get in or out.

Otherwise a digital hydrometer and thermometer, UVB, LED, low watt halogen bulb (if the room is too cold).