You still should think about adding LR and LS to your system as those too help with filtering - see the link I pasted below. And that's fine, having twice the turnover that you need is fine, just make sure you keep your water supp.'s in good levels, and as far as price goes, that depends on the brand you want. So far the cheapest (decent) one is the Prizm Skimmer by Red Sea. It's not my favorite, and by far not the best of the best, but it is on the cheaper side, and will function decently, so yea. But I would suggest lookin to spend on average 120-175 for some pretty good ones. I like the Bac-Pak skimmers by CPR personally, and use those on several tanks, and their smaller model was about 120 when I got that one, so it may be around the same or cheaper now.pebble;1038338; said:i only have a 29 and my hangon filter cascade treats up to 50 gallon. and how much protein skimmers go for in stores if it will help keep my tank safer for fish.