when the lights off, hes out and about. when the lights on (during the day) he'll come out once or twice to chase the guppies and pick up some food. i got him at about 1" for $17. hes now about 5 1/2 - 6" (full grown i guess) and hes had his lil spot in the top corner of the tank ever since...kinda funny that he hides at the top and not the bottom. he does have some great personality. if the lights off and the kitchen light is on, he'll be out and if i look in he'll come right up to the glass and stare back then do circles and try to get me to follow him to the lid (i guess so i can give him food, 'cause that usually makes him stop paying attention to me).