Clean lid for aquariums

[SpateD]

So I have a breeding system in place... and to help keep the humidity down in the room, and less top off water, I'm looking to place a hood/lid on the tanks.

I currently have spare acrylic I had lying around, which has warped and how hardly serves it's purpose.

The thing that makes this a difficult one is that it has to be clear so the lights can still go into the tank, and my return plumbing flows overtop of the back of the tank and in. So it has to be able to cut a hole out of it.

I'd also like to have a little spot I can use for a feeding hole so I don't have to lift the entire lid every feeding.

There are 2 tanks. 20G long's. 30x12x12 I think.

I've read about clear Lexan... and was thinking about trying it, but for the price of it, I'm sceptical. It's been known to warp with heat also.

Does anyone have any other ideas?