That's where the custom hood comes into play. In reality it wont even be the fluvial edge if i successfully implement my concept. Now that i think about it, it would be more like a custom tank enclosure. I could drill through the glass and get all the plumbing done that way and have all my stuff inline or in the sump. I could put the intake under the substrate with some mesh or sponge to block big particles, and outtake could be some waterfall built into the hood. At first glance my nano would look neat with nothing in the tank or any plugs coming out the backSounds like its quite possible. Its always good to increase the volume of your system. If you have the room go for it. The only issue I can see is how you will plumb it for overflows and returns.