Are you talking about the basic upgraded Prizm, or the Prizm Pro Deluxe (the one rated to 200 gallons)? The Pro Deluxe can be touchy but it will work - do you have the manual? There's a PDF of it on the Red Sea site.
If you do have your bag of carbon in the return area, you really need the media basket. Holds it right in the throat of that chamber.
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