Return pipe via overflow pipe

My tank is like that, and have double overflow, with another pipe running inside the secon one, for cables to go back down to the sump.
 
@Fraser W did the same with his frag tank.. worked very well and shouldn't be too difficult to do
 
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29012013305[2].jpg
 
its a great idea, wild on pets run there store like that....

the nozzle is called lockline, you can get it from engineering places as its used on lathes
 
Would work well on a bean animal overflow, on the emergency channel as this channel is rarely used..
 
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