I have my adults in 41s At about 1800 gm or so it depends on the snake. I have a heavy male who if 2200 but he is short. He looks fine but my big female I have she is very long. She looks far too big for a 41. (4300gm) She coils and touches both sides. I have no hides with her as she takes up over half the tub coiled. I am moving her out to an enclosure soon (33x24).