Its insulation foam from the brand name "great stuff" which I sprayed onto the glass sides of the aquarium. Then I covered that with black aquarium grade silicone to affix mulched peat on to it. There is drift wood interspersed along the background that is held in place by the insulation foam.
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All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
-J.R.R. Tolkien, LOTR, Fellowship of the Ring
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