getting skimmer need help

mustang 50

New Member
hi i just recently purchased a marineland 100 for my 75g reef i have a couple questions pertaining to the skimmer
what does the water level have to be at?
how do i know what to set the value to for optimum skimming.
i have a refugium with a 8in sand bed and cheato
and another compartment that will house the skimmer but my water level is usally only around 4-5 inchs
any information would be of great help
 
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