powerfilter as in peguin/emperor from marineland? man the only real complaint i have from them is that they create bubbles in your tank, not just any bubbles, big bubbles, im considering just getting rid of the small peguin i have now, what a waste of 20 bucks..
and yes bubbles are bad, why? because when they burst salt sprays everywhere lowering your salinity.. its nice to see dried saltwater all over the place, my opinion, get rid of it and get a deep sand bed and atleast 55 lbs of liverock maybe 40, they will act as your natural filter
As for protein skimmers, yes people have had great results and beautiful tanks without skimmers, because of frequent water changes, it doesnt mean that if you have a skimmer you can skimp on the water changes, i recommend atleast bi-weekly water changes to make sure your tank is stable
prizm in my opinion seems like a cheap skimmer, sure it looks cool at first but in the end, a seaclone/cprbakpak/berlin skimmers are way better and seaclone is only what? 20 dollars more? im personally going to buy a seaclone for my new tank, prizms are also noisy so if its in your room like mines, you'll get used to the sound eventually
hope that gives you some ideas