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I have had 3" styro sheets with the same dimensions under my pond for over 5 years now with no trouble. On the sides i have, if i remember correctly 1" or 1.5" then 3/4" plyboard. Then there are two 90mil EPDM pond liners on top of all that. I try not to walk on it as much as possible. Im sure by now there's been a great deal of compacting on the bottom 3" styro. Its such a large body of water that it does remain pretty stable. I control the temperature by the ambient room temperature. This is simple because around more than half of the pond's outer sides lies baseboard heating. Then in the warmer months, despite being in the basement, there are window wells with normal-size windows for ACs and exhaust fans.
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