Tideline AIO 21.4 Cube Intake/Overflow Guard

The Tideline Overflow Guard is designed for both fresh and saltwater aquariums, protecting without hindering performance. With its effortless installation and discreet design, this guard prevents small fish, fry, anemones, and other inhabitants from entering your overflow, giving you peace of mind.

The openings are roughly .07" round to keep out the smallest livestock.

It is recommended to keep the holes clean of debris to prevent blockage. Since the holes are small they can clog quickly, so check them periodically. 

Note: If the holes provided are too small for your setup, you can modify them by drilling or cutting. This may be necessary as intake guards can alter the flow of your tank.