I have three turtles. A Map, A Painted, and a Yellow Belly. I have had them about 7 months now. I got them at about the size of quarters not they are about 2 1/2 to 3 inches. My ultamate goal is to have a tank built that is a tank that is a 4' by 4' cube with a height of 3'. This way when they are full grow at almost 8-10" they will have plenty of room to move around the tank. I know a 40 gallon breeder would work for one maybe two but I think it would be to crowed for all three. When I got them I was like aww they are turtles how fun could they be. But they have awesome personalities. I might see what it takes to at least put two 40 gallon breeders together till I have the money and room for a tank of that size. One thing I am going to do is use aquarium safe silacone and sand to make the floor covered. I have noticed the turtles trying to scratch their way out....lol