I have mine in plastic tubs. It works great. But they do need at least the top to be well ventilated or they'll develop respiratory infections. Just cut out a big square and cover it with wire mesh/hardware cloth. And if you want stackable tubs, just put the ventilation on the sides.
And lots of tubs come with handle latches now, so check them out at Target or Walmart. Those are super handy to prevent escapes.
Ive used a 71 qt rubbermaid. It's about a foot wide, a little over a foot long, and twice the height of a snake tub. I hold 5 males in there.
I occasionally put single nursing moms in 16 qt bins if the other females badger her too much.
And I use a 103 to hold 5-7 breeding females. The tub is pictured below. This is probably larger than necessary, but I like giving my rats space. Some are my pets too.
I know people who use around this size as grow up tubs. They can fit like 30-40 rats. But its a little cramped.
Old photo, but generally what I have. I now have a food hopper and take out the wheel when babies are present. I don't want a mama to make a nest under it. And as the wheel isn't fixed to the tub, I don't want squashed babies.
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