Honestly
We use concrete formed enclosures with rubber/plastic lining. Basically we form the enclosure in concrete and then coat it with "Rhino Liner" type roll on coating. Nice this is that the coating comes in different colors so you can paint it to what you like. We put a lip on the edge of the layouts so that they don't drag to much sand/dirt into the ponds (will happen no matter how hard you try to stop it). This prevents the ability to dig out and makes for a nice solid enclosure that is easy to clean.

Right now I have to
2 A. Miss at 8'
5 A. Miss at 3'-5'
1 C. Nil at 9'
1 C. Croc at 6.5'
and
6 A. Miss/C. Croc 2'-3'

Never have any probs with digging. They can dig in the sand/dirt all they want. They hit concrete and stop.

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