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Egg crate!! Go to lowes or Home Depot and just cut it to size. I've done it with both my 90 FOWLR and my 90 cilchid tank. You can find the stuff in their ceiling section
Those are better for reptiles, they will get nasty from the humidity and get covered with calcium. Why not get glass custom cut? Just a thin pane would be fine
Go with something like this from BRS...... it's a plastic frame that you cut to size & nylon mesh that you roll into the frame. If you've ever replaced a window or door screen before, this is a breeze to do.
I do agree that eggcrate is cheap & easy to use.... I have it on my QT tank. But, IMO, for a nice looking DT, it looks kinda cheesy. Not only that, it's also designed as a light diffuser..... I can almost guarantee it's affecting your PAR readings, especially when used under a suspended light.
I do agree it looks a little on the cheeeeeese side, but when I came home to a $40 Springers Dottyback that went carpet surfing, a quick/cheap/effective solution was necessary... Just thankful I hadnt lost anything else while
I ran an open top!