At the minimum the 40g should be ok as long as he doesn't get much bigger. In my opinion (and I am sure there are many on here who would disagree) they need an enclosure big enough for them to fully stretch out. At 3 ft the 36in tank may be ok as long as he doesn't grow much more. My ball is in a 20g long at the moment and he is as best as I can get a measure around 27in. I intend to upgrade to a 48inx24in enclosure when I get the money saved up to buy it. They can be expensive. Make sure if you get the 40g breeder that you monitor your temperatures and humidity as it could be a bit hard to keep those at the right levels.

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