I like the Marineland C-360 for filtration on smaller tanks. I run them on both of my 75's, and it's one of the filters I run on my 180. I like it because it requires very little maintenance. The FX5 can clog up weekly, and the Marineland only requires maintenance once per month, if that. It's a 360 gallon per hour filter for about a hundred and fifty bucks, and after running all three for almost two years, I've never had a problem with them. Hope this helps.