Greetings! There are several ways to plumb a refugium. Some people have it 
under the tank. This way, water is gravity fed from the tank to the refugium 
and pumped back to the tank....just like a sump. Another way is to place the 
refugium above the sump and allow refugium water to gravity feed the refugium 
and gravity feed back to the sump. Another method is to place the refugium 
above the tank and gravity feed water back to the tank...avoiding the sump 
all together. Another method is to pump water from the tank and then gravity 
feed it back to the sump. Otherwise you can have even water levels in the 
refugium and tank and then siphon or pump water back and forth. Mine is 
set-up above the sump. I use a small powerhead to pump water from the tank to 
the refugium. It then flows by gravity to the sump where it is returned to 
the tank. Amphipods and baby strombus snails seem to survive the skimmer, CR, 
and return pumps because I find them alive (before they are eaten) in the 
display tank. Many people discourage running refugium return water through 
power heads/ pumps as it  can damage/kill the very things you are trying to 
propagate....
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