What info on the net regarding puffers is slim. I have always been interested in them so dug up what I think is accurate info. South American puffers are also known as SA puffers, bumble bee puffer, bee puffer or BB puffer (has to do with their coloring) and as Scottyhorse mentioned their max size is 5" though mostly reach 3". Dwarf puffers are also known as pea puffers as they only reach the size of 1.5" as an adult. These are the only two puffers that I've discovered that are full freshwater. Dwarf puffers don't have the teeth issue that SA puffers do. If they don't chew enough snails, rocks or driftwood that their teeth will have to be trimmed by the owner. Something I may have to look forward to as mine doesn't chew the snails he just sucks part of them out and leave the res to decompose hence the messy eater and good filtration is needed. Here's my Puffy as my son calls him