That's a great looking setup.. I'm not an expert, but I'm pretty sure u will want to take the moss out, it can kill them if ingested. Also the heating pad should be put up on one side of the tank instead of on the underside, if ur pac burrows down too close to the pad it can get him too hot.
There are much more experienced peeps on here that will prob point out anything I've missed. Ur Pac is a great looking boy/girl as well.