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I've done projects like this with Drylock and they turned out well.

A couple years ago I also wrote an article for the AMAZONAS blog on a similar kind of construction...

Build a Lightweight, Waterproof Concrete Basin for Ponds and Plants - AMAZONAS Magazine

Make sure to coat everything thoroughly with at least a couple coats. Apparently there is evidence polystyrene insulation can leach hormone-disrupting chemicals. There's a couple of discussions on this here if you do a search.
 
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