I've mentioned this to a few Calgarians, but I've found a product that eclipses eggcrate in fish-restricting overflow performance.  Phone a local nursery and ask if they grow lilies. Ask if the lily bulbs come in plastic crates. Ask if you can buy one. What you'll end up with is a lovely latticework crate, with slats about half as large as in eggcrate. It consistently stops my orange diamond goby from sump-surfing.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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