I have a 3 section sump.
Overflow and skimmer in left section, return pump abd heater in the middle and refugium on the left.
75% goes into skimmer section and 25% into the refugium.
Both overflow into the return section and back to the tank.
Type 'melevs reef' into Google and look in the sump section for a load of designs and pros/cons
Dunc
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