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Ok, so I'm considering doing this with my new barebottom 50G tank in combination with a 20G sump/fuge filled with Chaetomorpha with a fairly light fish load. My question, what's the minimum flow you could use with a 5G bucket mostly full of sand? Could you use an aqualifter, which I believe maxes out at 5gph? I was thinking just drawing in water from the refugium (where the flow is low and most detritus will have already settled). I ask because I have one lying around and if I have to buy a pump for the DSB it goes down the list of priorities (other priorities being things like lights).
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