These acrylic lids have a tendancy to bow down into the tank anyway. My tank is a 75 gallon with a double lid as well hinged in the middle. We bought handles that just slide over the acrylic (not glued on) so when they bow we just flip them over until they bow again. They really are a pain but convenient when it's feeding time.
*Edit* to add not to make the slits too long a few inches for each one should do the trick
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