a couple people already mentioned the taper. I didn't really think about that enough when I bought my poly stock tank, and when I first set it up it was the biggest enclosure I had used (and still is) so I was a little blinded about that fact. However, now that I've used it for a while I do notice that they not space efficient at all.

For example, the exterior dimensions of the trough are about 58" long x 40" wide, but the interior dimensions are closer to 50" long x 30" wide, and it tapers briefly in the middle of the tank to only 24" wide.

That's actually why I'm looking into building them a new enclosure this summer. I could get a TON more floor space in a cage that would fit the available nook much better.

If I were going to do it again, I would have gone with a metal stock tank.

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