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I have many puffers scattered among several large tanks(mostly green spotted and figure 8). Some I have had for years. They're fun guys, with alot of personality. I am wondering, can you tell the sexes apart? I've been watching these critters for a long time, and have never notice any psyical or behavioral differences.
I think that with the exception of dwarf puffers, they're next to impossible to sex. At least angelfish will pair off, then you know you at least have a compatible male and female. Puffers are usually so intolerant of each other in a tank that even if you do have opposite sexes, they're usually not happy to see each other.