You're welcome. Any brand of silicone is fine so long as it's 100% silicone.

Many people also use great-stuff foam, spray it, and carve it after it dries. Look through Donlisk's pages. He has step by step instructions.

Another way to do it is to create an eggcrate false bottom. Since you'd like a land and water area you could make on with "stairs" for them to head to land on just one third or half.

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