In my opinion these are the best hob filter on the market for one simple reason tell me another hob filter that you can choose the media for or have any thing except a pad with carbon in it and a bio wheel at best that i'm not a fan off lol. Any way's when i first bought my first one of these it was on a 55 with two different bio wheels. And they both died lol and this thing stayed quite and with no problems for 3 years i bought lots more after. ANy ways good luck on the sale's if you still have any figured i'd give you a bump for a good reliable hob filter.