"Cliff L" wrote in message
oups.com...
It's more natural than a plain glass bottom.

True, but I wonder how common a gravel subtrate is
for aquarium fish in the wild, as opposed to mud or
larger river stones.
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That depends where you live. Here the river bottoms are covered with stones
and pebbles of various sizes, the soil washed downstream ages ago. On L.I.
the ponds and inlets were sand, pebbles and stones. The lake here has a
mud and rock bottom.
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Koi-Lo.... frugal ponding since 1995...
Aquariums since 1952
My Pond & Aquarium Pages:
http://tinyurl.com/9do58
Troll Information:
http://tinyurl.com/9zbh
Reading Headers:
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