Congo puffer, bailey puffer and arrowhead puffer are pure freshwater, but you can keep only one in a 2ft tank otherwise they will fight. Red eye puffer (carinotetraodon irrubesco) is about 2 inches long and also pure freshwater, can keep maybe 2-3 in a 2ft tank.
All 4 puffers mentioned above can be found in singapore however now is not puffer season, hard to get puffer.
Congo puffer normally cost about 60-70 dollars, bailey 30 dollars, arrowhead and red eye about 15-20 dollars.
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