You're going to want to start him out in a tub....in fairly cramped quarters. Bloods like to be almost cramped to feel secure. How big depends on the size of blood you plan on getting. I keep my 6 year old adult female in a boaphile 421D and my 3 year old sarawak (boreno) male will be moving into in an animal plastics T10 when i get back from vacation and have a chance to put it together.