04-21-2009, 12:03 PM
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OK, maybe I need to do a little searching but styrofoam and concrete? Is this the typical white foam that you can buy in blocks and then covered in concrete?
Wouldn't concrete leach lye into water? Do you seal the whole decoration, cause you wouldn't want to use silicone caulk for that.
Is the caulk to glue it to the bottom so it doesn't float?
I'm fascinated by this, I've never been happy with the size or price of pet store decor and gluing river rocks together makes for a pretty heavy assembly.