This is what I told the manufacturer on the phone and he just kind of ignored it, regarding getting sand and other things going in from the display lolBull. Absolute bull. A tiny gap is nowhere near enough to allow the flow required to "eliminate dead spots". If anything, it would just collect detritus and sand from OUTSIDE the overflow that would normally stay in the display... Y'know, where it can be easily cleaned.
Seems like a first draft brainstorm idea that should not have made it into production if you ask me.
I think they get the tank from China, then go put on this acrylic overflow, but the glass strip they use to silicone only goes down to the silicone seam for the back/bottom panes and they just don’t even attempt to glob it or do anything else - then claim it’s by design