i use plan pine shavings and i have no problem and i got about 40-60 asf in 3 large tanks. ( counts on fingers) I not changed the liter in mine in about 2 weeks and no oder.. I do ahve an issue with them chewin .. they chewed 3 plastic bowls, several water bottles( stoped this by getting a tin sleeve made ot protect th bottles) and Ialso place a strip of plywood ( 2inch wide about 5 long) in each cage and they happier now..

i also check the diet if feedign somethig high in salt may make them go more causign the smell.