Saltwater FISH ONLY tank! HELP ME!?

honesty, for fish only you don't need a protein skinner at all, I don't have one and my tank and fish are fine plus skimmers are outrageously overpriced and fish store owners will tell you that you need one cause they want to sell the things and make money. as far as the powerheads you don't really need, you use poqerheads to move water and create current which is always good but really is used for reef tanks . a canister filter is expensive but I've never had a tank that big so I don't know, is just get some high powered hang on back. you don't need uv unless you geting anenome. a fish only salt water tank really is simple don't let greedy fish store owners try to rip you off and buy their not needed crap. I have a 20 gallon with a underground filter and a hang on back aqueon, my water is crystal clear and I've never had to do a water change for a half year now. but I was told that was a dumb setup and not filter well, and o buy the way plez buy my exspensive protein skimmer