I own several Fluval Evo's and hated that the first chamber was mostly wasted by just overflow use. So I created a hang on, easy to remove media tray for the first chamber.
Now you can add additional floss or media of choice.
Does not interferre with overflow weir at all. The hanging brackets line up with existing overflow weir teeth. Now your center section will not clog up no where near as quick.
Some assembly required:
You will need to add a single drop of super glue to each hanger bracket. There is convienant slots where each one goes. This saves on shipping fee's by over half the cost.