It's just at a local pet chain down here in aus, called pet barn.
We're smart enough to ask customers about their tank size and set up etc and we do inform everyone that these guys are aggressive. If their tanks are not big enough we don't sell them.
The tank is a pretty small one, gonna guess maybe 10 gallons. I didn't get a full tank shot but I will next time I go in there.
They are separated from small and large.
Some more id's for you guys! It's also good for me to know so I can let customers know!
First a little blue stripy guy. He's pretty small.
Second is a pretty blue