do the busing trays have ridges on the inside? if so it's a place where mice can chew.
you could keep 1.20 in a tub that size.i agree that those tubs are too deep.a step for drinking would have to be non chewable and heavy so it stays in place.
the above mentioned vision tubs are just the right height,my bud keeps 1.9 mice in his.have fun !