Kim Zolciak and Kroy Biermann are back to their squabbling ways ... with things so toxic their marriage is now completely beyond repair ... so say sources close to them.
Our sources tell TMZ, the pair's latest falling out doesn't have anything to do with the newly released police body cam footage emerging of their explosive fight from Nov. 20 -- instead, it's over their continued money woes, their home, and the overall state of their marriage.