Quite Overflows...

[secretweapons22]

I am setting up my Neo Nano in the near future, however it only has 2 overflows. I have been reading on the subject and the silent designs that I have found require 3 overflows. Any links or descriptions on how to set up the overflows to be silent but still safe?

I have heard of putting an elbow on one of the overflows to make it a tad higher than the other and placing a gate valve on the lower one. Then tune the gate valve to get a "true" syphon.

Has anyone done this?

O I forgot to add, in case you don't know how the overflows are set up on the tank.

It has two one inch overflows. Each has its own overflow box. The return is a waterfall so converting it to a fail safe is not an option.

Also even though I could convert, it would kinda defeat the purpose if having this particular tank IMO
Thanks ..