A male can live fine in a 10 gallons, 20 is fine too but I would not go any bigger for a male. Males hognose get to 150 grams on average so it is small they are also picky feeders and like BP seems to benefit from smaller spaces in those times.
Deborah, i wanted to ask you what size tub would be appropriate? My guy is just over a year old and currently in a 16 quart tub.