Overflows

LifeReef probably makes the best overflow box, but I used to have one from the Critter. It worked great...although, I took out the factory prefilter/standpipe and fitted a Stockman standpipe. It never lost siphon though.
 
I prefer the U-tube type. I have a cpr (square type) and have had issues with it.

With enough flow, the U-tube type (lifereef) are the most trouble free...IMO.
 
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