I have one at 260 grams now and she is doing fine in a 14 qt tub. I wont take her out that for a while. My other one is at 380 grams but he had some feeding issues when I got him so I moved him into a 6 qt tub temporarily and fed smaller prey items and he is back on track now. I moved him into a 14 qt tub and he continues to eat well. Once he eats a few more times I'll move him to a 28 qt tub and keep him there provided he keeps eating and stays stress free.