I don't have much experience with skimmers, so any advice on this would be helpful. I've been offered an asm g4x for basically nothing (trading a sump I got for free). I would be running it on a 180. But I've read some bad reviiews, such as the pump not being right for the skimmer and the skimmer not doing much if its put on a tank smaller than recommmended. Any advice on this skimmer? I wouldn't mind spending the money on a skimmer, but this is rated for 450 gallons and basically free. Also would the skimmer work better if I used a mag 12 that I have laying around since its a stronger pump? Sorry for the long post.