You can buy DIY Aquarium Screen Top Netting Kits from Bulk Reef Supply. They use a clear screen material. One of the only problems I could see when covering the top of your aquarium is salt creep. With the evaporation of your tank, I could see salt creep adhering to the screen and would be a bit of a pain to keep clean.
On the plus side, obviously, it keeps jumpers in your tank. Wrasse's are well known for jumping out to their demise.
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