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
The skimmer your asking about is the second version of the prizm skimmer and can be found here http://www.redseafish.com/SubCategor...ID=93&subID=34
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.