In my opinion i would provide him with a slightly arboreal enclosure as these guys LOVE to climb, they are also big fans of swiming as well. If its a 20 gal long your talking about i would bump him up to something a tiny bit bigger and provide plenty of branches to climb on, but most Colubrids can live in fairly small tanks like a 20 gal the rest of their lives, it is true that big enclosures CAN cause stress some times, so be careful on the size you choose.
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