pretty sure there's only one fx5..$220 is a good price brand new..if it's not brand new that's a bad price..its' a plus if it comes with new/used media
Ive got 2 on my 210 and only cleaned them once in a year. Their awesome my tank is crystal clear at all times. After changing the water it gets a little cloudy and within 5 minutes its clean. Hands down amazing!!!