Whenever I have had a skimmer stop skimming it has been either the airline/venturi blocked or else the pinwheel plugged up.
Other possibilities include: when you moved the tank, did you change the water level in the skimmer chamber of your sump? Maybe make sure you are within the recommended water level range for your skimmer. Another factor to look at is the output restriction, have you gate valved the outflow pipe from your skimmer? My old Euroreef used to be quite inconsistent until I did the gate valve mod.
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120 gallon sps/anemones/LPS reef since 2004
Apex controller
8 x 54 watt T5 PowerModule
Herbie's silent overflow system
Jebao DC 12000 return pump
Jecod CP-40 Cross-flow circulation device
Mini Bubble King 180
Barr Aquatics calcium reactor
Bucket fuge
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