In a few days I will be getting another Pixie, another male.
I thought IŽd pass on the info I got from the breeder:

In his opinion ABFs are fine housed together as long as they are the same size.
He imports/exports them and he keeps them grouped together according to birth dates, so they all grow roughly the same rate.
He said there is no difference if you house males together with females or just other males.

Keep your new one separate for quarantine reasons if you are not sure of the supplier...just until you are sure it is healthy.
If you buy a new one do not put it in until equal in size of the one you already have.

Just make sure your tank is large enough for them both to have a space of their own, he said most times they will group up though.
Make sure the food source is plentiful so both get enough to eat.

I will post photos of my new boy who I plan to name Pablo Pickle.

As far as I know it seems the same for ABFs as it is with Cane toads, wide mouths...greedy bellies.
Keep them well fed and happy and they should not try to eat one another.