Coral Vue Technology AC20197 Octopus Hang-On Back Skimmer for Aquarium Filter, 75-Gallon
Brand new, never used. Ended up going with another model. Starting off at $135. Willing to trade for coral or maybe a friendly fish that will do well in a 55 gallon.
It is this exactly:
http://www.amazon.com/gp/product/B00...ilpage_o00_s00