Oh gosh, that's a really neat idea. Thanks! I'll go look around and
see what I can find.

This is just in general, but one can get black plastic stock shelves and
only use one level... bigger pond, would have lots of shelves in one box.
As an example: http://tinyurl.com/jq89u I know you can find them in
different sizes & colors. ~ jan

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(Do you know where your water quality is?)