It appears that a guppy has disappeared. We have a 10 gallon tank with 5 (now 4) male guppies. The tank is cycled. We are currently away from home and have a friend taking care of the fish. We have an automatic food dispenser that is working fine. My theory is the air turned off and the water got hot and the little guy couldn't take it. The question I have... where did it go? Is it possible the other guys ate him? Thanks for your thoughts. The other fish seem to be doing fine.