wouldn't the rats be better fat for your snakes, they can't run fast, and the snake don't need more than one to make it satisfied. I was breeding rats for a bit untill I gave up and I just used those large tubs from Bunnings or Crazy claks but I did learn that if you don't want ants to get into the containers that you can use the lids you get with them, put them under the tub and fill the gaps with water ants wont go anywhere near it. also if u drill holes in the sides for ventalation make them high so the rats can't chew there way out. or make a window on the side of the tub place chicken wire on the side or fly screen and cover the edges with a metal frame and bolt it on so the rats can't chew around the plastic. get some water bottals and ever else you want. oh and if you get those bags of hey from the petshops they'll last about 2 months + and every week when you go to clean them out, its really good for your gardens or vegy patch.
cheers Jody