Innovative Marine Nuvo Fusion 25 Lagoon Polycarbonate Pro LidTired of Acrylic lids that just bow or warp over a short period? Well this is why we use only the highest grade Polycarbonate material, gone are the days of warping and bowing! Our Innovative Marine lids are created to sit 4mm inside your tank with an outter rim to sit directly on your tank glass which gives you a slimline look. The lids have UV protected mesh which is secured using silicone bead which allows the mesh to be changed when needed.