Overflow - Clear 90 degree elbow

[ahud]

I have been on a mission to find the least obtrusive overflow possible. I came across the Xaqua INOUT. I like how small the drain is (Don't care about the return). But the design is essentially a grid over a bulkhead. But that led me to setups that do not run overflow boxes at all.

 

So going farther down the rabbit hole, I have found setups running an upturned elbow. But I'm not sure how loud these setups are. Would it be possible to run two elbows, and have one run at a full siphon and the second to skim? 

 

I think if I mount the bulkheads on the side of the tank and go with these clear elbows, the setup would be pretty clean. I would just need some kind of grid to keep critters out.

https://formufit.com/collections/90-degree-pvc-elbow/products/3-4-in-90-degree-furniture-grade-pvc-fitting-connector?variant=38107431829653

[mitten_reef]