I just purchased a baby Florida Kingsnake and have an unexpected problem. He is being housed in a 10gallon aqaurium and I can't seem to get a good temp differenrce of more than 3 or 4 degrees between the cool and warm side. Right now I am using an overhead light bulb for heat that is placed on the far corner. Should I consider undertank heating or is this gradient good enough. Any suggestion would help.

