>>MayDay,
>>Didn't you tell me once that a 40 gallon regular tank is a pretty good size for a mud? Just as good as a 40g breeder?

It's floor space you want... more floor space & less height. Most aquariums have too much height to them as fish need the vertical space more than horizontal so that of course makes it a challenge for reptile keepers who need the opposite usually.
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PHWyvern