I had one, didnt get it to work right ever. Actually at first i thought it was a filter cuz it didnt do anything. The bubble chamber is so tiny and the adjustment wheel is so... imprecise... i either got no action, or total overflow
I have a pro prizm on my 125g. It is the bigger module that says it rated for 300g. I didn't like mine at first because it was loud and I had to constanly regulated it to get any skim mate. It went out because of the impeller broke. I replaced the impeller ( manufactor replaced it for free) and now it is working like a charm. No noise and lots of skim mate. No adjusting. Maybe it was a faulty impeller all along!!!!! I also have read that they have a break in period. At any rate I am now a happy camper.
just to mention it, I run a coralife super skimmer on my 30 gallon tank, and I *thought* it worked well...
...until I hooked up my Aqua-C EV180 on my 150gallon tank. That thing is flat-out amazing, it compleatly puts my superskimmer to shame.If all Aqua-C products work equally efficiently, I'd get an aqua-c for whatever size you need (probably a remora if your looking at a prizm)