You can, however it is recommended that you spread a layer of silicon on the glass first. The GS does not stick to the glass very well long term but will stick to the silicon. The silicon will stick to the glass. So the silicon is sticking to the glass and the foam is sticking to the silicon. I did mine on the eggcrate because if the water feature fails, and it actually did, I can take the whole thing out of the tank easily and fix it and replace with little problem.
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