OK, the 'columbian' name threw me off for a moment since there are no FW puffers in Columbia. These are Colomesus asellus from Brazil, Guyana, Venezuela, and Peru. This is a freshwater species that is occassionally found in light brackish water. They're reported to grow to 5.5" but, typically are seen to 3.5". The species is relatively peaceful towards conspecifics. They can be fed on live & frozen blackworm/bloodworm, snails, krill, shrimp, and small crayfish. The only downside to this species is that they're prone to overgrown teeth that require trimming about every 6 weeks. Feeding them lots of shelled foods will alleviate having to trim their teeth by hand.