You may remember that I had a plastic tank that I was having a hard time finding a heater for old tank Everytime I put my hand in the tank the water felt so cold (was always between 68-70 degrees). I felt so bad (I knew it was stressing him out) that I decided to get him a new home. It is a 10 gal glass tank, he seems so much happier now that we has heat and more room to swim around.