lidless aquarium

I picked up an odd sized aquarium(18 x 30 x 25) recently and am searching for a lid for it that can be clamped down. Hopefully someone can point me in the right direction, I was never very good at DIY aquarium lids!

How bout getting a glass cutter to make you one from plexi? You can drill air holes in it and mount a latch system to it so you could lock it. I bet they would be able to do it out of other materials as well.

You could also buy fine mesh from a hardware store and just cut it and make your own tie-downs with wire or something