Planet Aquariums Studio Nano 3.5 Gallon Lid Ultum Nature Systems this measurement is taken from

this measurement is taken from INSIDE the glass

Built for the Fiji Cube 22

For the Marine X version

This polycarbonate lid is made to fit the Waterbox Peninsula 5526

Built for the CADE REEF 900 S2

Planet Aquariums Studio Nano 3.5 Gallon Lid Ultum Nature Systems this measurement is taken fromBuilt for the Planet Aquariums Studio Nano 3. 5 Gallon, this lid is cut from 3 8" optically clear polycarbonate and screened with 1 4" clear mesh to keep your livestock where they belong without cutting into your light. If you prefer black mesh or 1 8" clear mesh, you can select that when you configure your lid. Every ClearView lid is proudly Made in the USA. Made to order, built to last. Choose your lid style above, then click Customize My Lid to add