My male green pacman literally has never pooped outside of water.. I've had him for 3 months now and the only time he has ever pooped was in his water bowl as a baby and now I put him in a lukewarm (80 degreesish) bowl of water every 1-2 weeks and he will go like clockwork. My albino on the other hand goes about every week in the dirt where he sleeps, he refuses to go in water.