Hi again. Have just realized that your basking light is 78. It should be around 90 at the hot end of his enclosure and around 70 at the cool end (and no heat at night when indoors). I think they need the warmer temperatures to get their digestive juices going, so try raising the temperature at the hot end (bring the basking light closer to the floor until it reaches the right temperature). It's really good that he's drinking though.
Nina
