Id personall go with the south american puffer colomesus asellus, these reach 8cm and come from the amazon basin, they are generally community safe. we got about 30 imported a few months back for the shop from columbia great fish only lost 1 or 2 so a low mortality rate other than being prone to whitespot. some of our customers have em in with discus and cardinals with no problems although with puffers the temprement vaires with each individual, Feed bloodworm and other meaty feed such as mussle, prawn cockle etc... also add some snails as they do tend to get overgrown teeth.
