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I agree that the Prizm would be maxed out on a 55. The deluxe with the surface skimmer should do a better job than the regular Prizm though. I also have a Prizm running on a 20g tank and it does pull some stuff from the water. The only problem I have had with mine is keeping it adjusted. If you get the water flowing through too fast, it will fill up the collection cup and spill over in the floor. As for the price, that's about right IMO. That's about $3 less than I sell them for. If you can justify the extra expense, I think an Aqua C Remora would do you a better job. You're looking at about $180-190 for one of those with the MJ1200 pump and a surface skimmer though.
I have one of the old school prizm skimmers and as logan said its very sensitive to adjustments. One slight chjange could go from a very dry foam to a fairly wet foam. For the price range and the skimmers that are wwithin that price range I feel its a good skimmer. For the size tank your looking at getting I have to question how well it will work.
What I like to do is take the max tank size the company recommends and cut it in half. So a 90 gal tank capacity would be more like a 45 gal tank max.
Its rated for 100 gal tank and has a surface skimmer attached to it. The surface skimmer should increase its effectiveness to some degree since its no longer pulling water from about 5" below the surface but instead taking water from the surface.
While the Remora is in a different price range (approx 2X the cost) I would classify it as a more efficent skimmer than the prizm. Note: this is based upon my experence with the prizm classic.