Catriona,
I have used 100% silicon (available at home depot, comes in a tube), with cut pieces
of glass (Home Depot or Lowes may be able to do this for you), and a small aquarium
underwater filter.
I just saw an easier, less elaborate idea, check out the recent Living Vivarium
article in the March issue of Reptiles. I am thinking of using the method described in
this article for a shorline vivarium. I think it would be great for my Ptychozoon
kuhli and some Bombina orientalis (fire belly toads).
Good luck,
Ron
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