Retics are active, intelligent, and powerful animals. My personal advice is to go big on caging. Large water area where they can get into and out of with ease. Give them a climbing area. Give them lots of attention as babies so you can grow with them. They grow fast and are hungry as babies. If a mainland female, you can watch yourself shrink over time as she grows. Buying small enclosure would not be good for you or the retic. The retic will out grow it quickly and they need a gradient of temps that are hard for smaller enclosures. Don't be surprised if you see the retic perched high up if a shelf or climbing area is provided. Don't be surprised to see the retic swimming or soaking. Rainbow (my 4 year old that is 18 ft already) has been seen watching TV, loves exploring outside on a warm summer day, and interaction on most days. I went large on her enclosure with a 8 ft X 4 ft X 4 ft, and still looking at upgrading her to a 15 Ft X 8 ft X 8 FT enclosure as she grows. Can she be healthy in a smaller enclosure? Sure. I just feel they need more interactive enclosure with lots of room to move around in. Some would say is over kill to go that large.