Quarter Round Overflow Lid
This is a black polycarbonate lid to place over the corner overflow boxes in a reef tank. This lid fits on the inner lip of the tank's trim, preventing light from filling that area leading to nuisance algae. This should keep fish and other livestock out of the overflow. The long edges measures 8.25".
Made with 1/4" thick black polycarbonate. This material doesn't warp like acrylic will.