hi, they'll be on their own,
Still keep a close eye, than can be very picky and nippy to eachother..
They have a rather individual personality.. How they ae generaly discribed is very short summary. Oftenly stated they only need 20 or 30 litre per individual.. But this can be very untrue if you happen to get 2 together who just do not like eachother. There actualy is no general way to describe these fish.
I happen to get 2 in a 110 litre tank.. According found information more then enough.. But it wasn't.. They can be extremely dominant towards eachother and restlesly chase the sub dominant around. HAd to remove the sub dominant because he was blowing off steam and frustration towards the other tank mates. Dominant puffer was picking on him, he was picking on his term on the others. It took the dominant about 8 months, to turn from a peacefull little cute honeybunny into a awfull agressive little moster, he owned on his own a 110 litre tank.. First hunted the pumila's around all day long, i took the pumilas out. It took him a few weeks to find everything else had to go as well and started hunting them aroumd. He stressed 2 barbs to dead.
Also, there is no saying what their gender will be. In the first few months of their life they have no gender, this they develop while maturing.. It seems the ones develop to be male first release a hormon to prevent the other from turning male. But still the ones i had probably simultaniously decided to become male.
Males can be extremely agressive towards eachother.. Males can even extremely agressive towards females. It all depends on the mood they are in.. They realy sleep and if they wake up on the wrong fin, it's chaos all day long till bed time.
They can be a monsterous as they can be cute.. No saying what you will get. They not only need a species only tank, they need to monitored closly in what ever setup you put them..
Anyway, if you happen to get a few getting along in such a small setup as above.. Consider yourself extremely lucky..
