The prizm is just a crappy skimmer. I just ran across someone else's comment, which summed it up perfectly: "No amount of modifications to a Prizm will ever make it do more than a mediocre job of skimming." I tossed a new cpr bak-pak on my 40g, after I pulled the Prizm. Within 48 hours I skimmed more gunk than my prizm would in 2 weeks. It wasn't a matter of the prizm needing adjusting either...if I turned the flow up a tiny amount, I'd have a full cup of mostly seawater.
The turbo floaters supposed to be a pretty decent skimmer. You want to adjust the collection cup so you collect dark fluid. Another way to phrase is it you want the foam entering the cup to be a dry foam...not super wet.
What you want is liquid in the collection cup that's at least as dark as weak tea, and it may get as dark as weak coffee (basically light brown to deep brown is the range you're after).
Former advisor and planted tank geek...life's moved on though.