When you'll stumble across something useful for your aquarium. Case and point was this past Monday. I found myself aimlessly wondering the aisles of Walmart and remembered I needed some new socks. So I pick up a pair of Hanes throw it in my cart and check out. I Get home and begin clipping tags and what do I discover? This: Socks were attached by those plastic T tag attacher thing a ma bobs... As soon as I seen it I immediately thought ... Man that would be perfect for an overflow cover for my tank! So I cut the hook off and grinded the plastic down a tad and, voilà! It's like it was designed for my overflow! Lol it fits on close to flush, and that's fine by me . The spacing between the grates seems like it's about 1/8th inch or just under 4mm (3.17mm) take your pick. All I know is that snails will now be banned forever from my sump... As soon as I figure a way to attach it securely so that it is 1. Secured enough it won't float off, and 2. Easy to remove and reattach in the event it needs cleaning and I need to get to the nut for my bulkhead in there. I'm thinking of drilling a tiny hole into the overflow box big enough to run fishing line around it and tying it off. What do you think? Good idea? I realize I now have the realistic potential of getting all of those ~135 holes clogged or blocked or obstructed by what ever, but I have a strong feeling that those odds are in my favor ( of it not happening and flooding the display) so long as I make sure the snails/debris in the tank aren't big enough to get caught or if they do I can just manually remove them there, vs a pump in my sump. Was also thinking of some sort of frag rack/probe holder in the event I start growing corals, and or have a controller that needs probes to he held. Just a friendly reminder to be ever aware of things around you, they may be reef worthy .