My guys like to attack their thermometers, the ones that have wieghted bottoms. I keep their tanks beside each other and they spend alot of time investigating each other and flaring. Then they take a break, rest and play again later. They also like to sit on their plants or hide in them. I have quarter size flat stones at the bottom and one of them loves to bury his head in them and pretend he is invisible. At first he scared me and I thought he was stuck or hurt. When I would check on him he would jump up and dart around like crazy, as if to be yelling, ha ha I fooled you!!!! He loves to play this game so his name is Rover cause he is like the dog who plays dead. When they see me coming both get very excited and come to the side to say hello. When I got them they barely knew how to swim and layed on the bottom, but with lots of good food, water and love they are happy, healthy and very very active. They are just like kids, and endless source of energy................