Anything less than the size of a small room and you run the risk of the two males killing each other. They are extremely territorial. A 55 would be fine for all of them except one of the males. Keep him separate. Or do two 40s and split them into two groups so each male has a female or two. Make sure the enclosure is well planted so the females can get away from the males if they need to.
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Torey
Eugene, Oregon, USA
1.1 Saharan Uros (Joe and Arthur)
3.0 Mali Uros (Spike, Turtle, and Tank)
1.1 Ornate Uros (Scuttlebutt and Shazzbot)
0.1 Collared Lizard (Rorschach)
2.0 Green Anoles (Bowser and Sprocket)
1.1 Chubby Housecats (Roscolux and Jenny)

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