My borneos are just babies, got them this year but for short tails in general rats are fine for life, some people do rabbits but most just stick to med-large rats. Cage size you are looking at at least a four foot enclosure and possibly larger, most get 5-8 feet but get heavy, 15-30+ pounds. They are often jumpy and nippy as babies but usually settle down as they get older, good feeders and good lap snakes, very inactive, very huffy and noisy.
Here's one of my 2015 borneos
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