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I suppose you could even stack three together to make a larger skimmer. Add additional pumps... scalable to any size tank! Very cool.

As far as how it might perform...I'm thinking that the neck is a bit narrow...one could add a bubble diffuser at the bottom. Other than that, it should work as well as any other Sedra pump based NW skimmer. What does it matter if it is made of polycarb instead of acrylic as long as the water doesn't fall out the sides!