Here we go, I found some info at the
pufferforum
"When it comes to care about c. lorteti, it's the same as c. irrubesco, with one exception: the temperament of the fish. C. lorteti is generally more aggessive than c. irrubesco. I would definitely recommend against keeping it with other fishes. They are bad at nipping fins, and probably would also kill if it gets the chance. It can sometimes be kept in pairs, but you need to be prepared to split them into different tanks if they get too aggressive. I've got a pair, and it seems like the aggression is increasing as they grow older, all though they've been aggressive all the time. A heavily planted tank is needed, both if you keep a pair, and also if you keep it single. C. lorteti is a semi active hunter, which means that it actively hunts for food (not waits for the food to pass it, like the lurkers do), but does not like to stay in open water anyway. It likes to hunt among plants and decor in the tank."