Clean lid for aquariums

[Coasting]

I have 1/4" lexan as a lid on top of mine, and yes it does bend/warp. But only mildly. More has to do with the thickness im assuming. Super easy to just take it off, give it a quick clean and just put it on upside down and let it flatten itself out.
No issues with lack of light getting through as I let mine get dirty as heck with salt, dust, pet hair, etc.