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Ever tried gluing rocks together with silicon? I have. It sucked. Not to be confused with stuck, which it didn't.

Alas, there is another choice.

There is a foam product similar to that used to fill/insulate cavities in walls etc that you can find in the water garden section of most builder supply stores like Lowe's or Home Depot. It is primarily designed for pond water fall construction, comes in black, and is listed as fish safe. Costs about $14 a can, American.

I've tested it and it holds well.[/i]
 

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The brand that is definitely 100% silicon is called Silicon I and is made by G.E. (?) and is currently available at my local Wal-Mart.

The issue withsilicon is not to buy any that say "mold/mildew resistant" as these have an inhibitor in them made from slow release arsenic! At least, that's what I've been told.

I would assume any 100% silicon is safe, with the above exception.
 
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