The smell isn't terrible, but I would suggest using something besides a tank. I've had nothing but bad luck with tanks for two reasons: 1 it turns into a suana of stink because the only air flow is the vent on top, 2 they can easily escape tanks even with good lids. Mine chewed through the plastic lock. Oh and they also eat the heck out of a perfectly good water bottle/wather bottle holder.

I use plastic tubs that have vents on the top and I cut out a square on the side and attach 1/2 square wire. This way I can attach the water bottle outside of the tank.