| Cut two peices of craft mesh, like the stuff strawberries come in (plastic mesh). Cut them both to the size of the divider, and lay some moss on one side and then put the other half down on top (ie a moss sandwich, mesh mosh mesh). And then in several places tie them together with polyester thread cotton will rot away. And place the mesh up against the divider and tie into a few places where the holes in the divider are. Make sure its tied well and a tight fit so there is no chance of fish ever getting between the mesh and getting stuck etc. | 
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