nmonks wrote:Here in England, C. lorteti and C. irrubesco are routinely confused and often sold together in one batch of fish. So you need to be extra careful when shopping.
To add a little to this: When I bought my lorteti pair, the male looked exactly like an irrubesco male, except for the tail not being red. But as it grew older, it transformed a lot, and looks nothing like an irrubesco now. The female, on the other hand, still looks very much like an irrubesco female. So if you buy a lorteti male, they are very often so young that it's difficult to see the difference (and as Corvus says, the shops don't know the difference for sure). The way to tell them apart, is to look at the tail of the male. If there's anything red in it, it's an irrubesco. If you want to see a lorteti male in its grown up colors, have a look at the POTM contest this month. They are stunningly beautiful, in my opinion.
I keep both lortetis and an irrubesco, so I've witnessed the difference in temperament. I must admit I like the lorteti best, but I tend to like the aggressive puffers the most. My irrubescos were pretty shy (I say "were", because I've lost my irrubesco male), and didn't show much aggression. My lortetis were a bit shy in the beginning, but now they show nothing of that anymore. They always come out to greet me (or rather beg for food), and they don't seem to be easily scared of anything. I really like the personality they have, as they are brave, social and pretty aggressive - just how I like my puffers.

They are really interactive, which my irrubescos never was (my irrubesco female, who is still alive, can be gone for several weeks, withouth me seeing her. And as she lives in a 22 G tank, that is pretty amazing. But I never worry when I don't see her for a while. That's quite normal for her

).