Jasper, my female, is super curious! Every time I put anything in the tank she has to go and check it out. I get nervous about putting the gravel vac in there because sometimes she gets really close to it and I'm afraid of sucking her up. When I first got her and put her in her tank, the heater light was on. Then I had to unplug it and as soon as she saw the light go out, she zoomed over there and stared at it intently. She started to drift backwards a little, so I plugged the heater back in and the light went on. She got even closer to it, then swam away after a few seconds. I kept unplugging and plugging in the heater so that she would keep zooming back to the light whenever it went on or off. It was really funny.