I'm in love with bloods.

To be honest though, I'm of the opinion that if you're strictly looking for a species that does best in a tub throughout its entire life, you might stray away from bloods. While tubs are GREAT for most of their life, full grown adults really seem to do best in large cages. The couple breeders I got to talk to at NARBC ALL use 4 foot long AP cages and really convinced me that such caging is the way to go for adults.