Glass lid or Aryclic lid?

[gsar]

Acrylic can sag when you use it as a lid. I tried it and that's what it did. Looked bad and always had to be cleaned.

If you're into making things you can go to RONA or Home Depot and pickup a framing kit that's used to make screens for doors and windows. Instead of using a wire screen go and get some bird netting and use that instead. Real easy to build and not expensive.

It's nice to be able to feed the fish without having to take off the lids and there are no shadows that I can see from the netting.