With my egg crate divider I keep rocks at the bottom on both sides to prevent them from pushing in the bottom I then put a mag float at the front of the tank holding it in place and then the back I usually put up against the overflow in my tank and put a zip tie through the egg crate and attach it to my overflow. I've never had it knocked over yet. Depending how you have it you can also tie off the top with zip tie or rope.
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I basically do the same thing and so far so good
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