04-18-2011, 07:11 PM
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I wouldn't use such materials, there are likely toxins in there, if not the tiles themselves, then the glues used to anchor them to the floor.
Thick plexi glass can be used, as can glass. Silicone adheres better to glass, you could simply put a dividing piece where its needed and silicone it around the edges to anchor it to the tank for stability. I would be sure to put a thin line of silicone around the upper exposed edge also to avoid injury to you or the crab. (it will dull the sharp edge) Once the solid divider is in you can then pile rocks, pebbles, etc to slope from land to water, making it easier for the crab to move as it needs to, and it would also cover up the divider and help make the tank appear more natural.