I would suggest either EuroReef or Vertex. Vertex is a EuroReef copycat. I have a EuroReef RS-180 on my 90 gallon reef, and it does a very good job. I would suggest an "over-size" skimmer as a skimmer's rating is the MAX tank size, so if you use an RS-180 on a 180 gallon tank it will be performing to the lowest standards that EuroReef deems suitable.
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~ Mindy
SPS fanatic.
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