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 So, reading again , do you have the Reefkeeper ? You'll need the L3 version with 2x power bars & SL1 module . Configuration will be :
 Head unit - at tank
 PC4 - plugged into wall at tank
 Purchase 6pin tele/data cable long enough to reach sump
 PC4 - plugged into wall at sump
 SL1  (doesn't matter which order , SL1 then PC4)
 Temp prob - included with RKL
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