hi again
judging by your last post you have completely fallen in love with this little guy and its really nice to see.
I think it would be wise to put the heater and have it set for 70f as this will help his digestive tract to move food through and not have it sitting in his gut when the water cools down. this may also get him eating as well. a buddy is a good idea but try to get one from the tank he came from or from the same store.
any other questions please dont hesitate in posting, its a pleasure to help you, take care.