BCIs, depending on sex and locale, generally get between 4-8 feet. The one you saw was likely a Columbian BCI, the most common of the available BCI in the hobby. These are known for their easy-gong calm temerpaments and medium size (males 5-6 feet, females 6-8 feet). Being that these are some of the most common pet snakes ever, finding care info shouldn't be too hard. They're very easy to care for....their requirements are similar to a Ball Python.