Has anyone ever thought about using the bottom of the overflow in a reef ready tank as a refugium? My tank has been running for 4 yrs. and i have about an inch of soft sand/silt built up. If i look from the bottom sump area up, i can see spahgetti worm trails. Every time i change my filter sock it has tons of copopods in it, so im sure they get in there too. Im just wondering if anyone has ever purposely put live sand/rock rubble down there....instant refugium..?