It looks to me like contaminants flowed down the film while it was hung to dry, leaving the marks you see.

I shoot a lot of Freestyle's arista 100 in 120 (foma) and I have never seen this happen on any of my films. You may have high turbidity in your water supply, or some of your chems (probably fixer) have precipitates in them. Try fresh chems and rinse in clean water with a little photoflo. Never squeegee foma films unless you like scratches.