Hard to believe that a big fat sea hare can squeeze through the spaces between eggcrate isn't it? Well it actually happened to me recently but fortunately my tank didn't overflow (sorry to hear about yours though) since the standpipe is so large. Since then I just superglued some plastic cross-stitching sheet over the original eggcrate. Durable and easy to clean with a scotch brite pad and rigid enough to keep smaller snails and fish out. Wal-mart or any craft store sells it for dirt cheap.
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