Yeah, lots of myths in this hobby! I had a Mantis that should have busted out of the glass and killed us in our sleep, yet no one I've talked to has ever seen it break glass. So don't believe everything you hear, putting eggcrate on the bottom is just going to mean one more place for detritus to hang up and increase the nutrients in your tank, and it's not like it's something that's easy to remove once your tank is set up
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