1) Give him at least a week or two to adjust to his place...chances are he will NOT come out.
2) I have the same exzact setup (not the kit...but same thing. Ditch the day light. Buy a $10.00 dimmer from Home Depot, get a temp gun, also from Home Depot or on Tempguns.com for $35.00. That heat mat WILL get too hot if you don't get a dimmer. Here is a picture of my 20L tank....the only light I use is a 100 Watt night black bulb...and it's more than anough to keep ambient temps right. Adjust the heat pad with the dimmer to a little less than halfway (YES they get that hot....) Check temps with the temp gun about 3 times a day and adjust as needed. You'll also need a mister, because you'll be misting a lot....tanks don't hold munidity well at all.
Also black Contact paper from Home Depot...about $6....stick it to the outside of both side walls and the back...makes them feel safer.