Thanks Mike, the borellii is currently the biggest amongst the lot. hahaNo, they should not cross. Keep an eye on the borellii. They are the most likely to lose in a territorial dispute.
my pebas male died... he was a big bad ass lol... my norberti is about 1.3inches. aggressive males but still afraid of my female borellii haha...But not for long! Both A. norberti & A. sp. Pebas are much more aggressive and territorial than A. borellii.