I use a Fluval CP2 along with a Fluval 306 in my Juwel Rio 180
http://www.swelluk.com/fluval-sea-circulation-pumps/
Was a bit noisy when I first set it up but it was silent after a week of running it in.
http://www.swelluk.com/fluval-sea-circulation-pumps/
Was a bit noisy when I first set it up but it was silent after a week of running it in.