I have an overflow that hangs on the back of my tank. That is how the water gets down to my refug. It has a prefilter sponge right before the water goes down the tube.
However....some how, that darn sponge makes it SUPER LOUD!!! If I take the sponge out it is nice and quite. I would like to leave the sponge in, but I would also like to make it quite.
I rinse the sponge every other day with fresh water.
-20gal tall sump / refugium.
-About 15-20 lbs of live rock
-60 lbs (3") of sand.
-2x65w power compact lights
-2x18w power compact in the refug.
-bak pak 2R
-3 LARGE feather dusters all differebt colors
-orange spotted goby
-12 or so hermits
-50-60 nassairus snails
-about 12 turno snails