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If you ordered the one on sale at Petsmart.com, it is backordered and will probably not be shipped. This is a clearance item and may not be re-ordered.
I saw that deal 3 days ago and it was on backorder then. I hope you get one.
The Berlin skimmer is not a very good skimmer IMO. But if you ordered it already you can make it somewhat decent by putting a larger pump then recommend on it, something in the range of 900 gph. I am switching mine out soon, but I currently have a mag 9.5 running my Berlin. The Berlin requires constant tweeking and its performance is affected dramatically by the water level in your sump it should be submersed at least 9 inches of water to skim anything. I would not recommend this skimmer for a any tank especially a 100+ gallon tank.
good luck! But I would be willing to bet within 6 months you will be buying a new skimmer.
Personally I would cancel it and pay a little bit more money for a better skimmer, your tank will thank you for it. And you will appreciate not having to adjust the thing constantly everyday.