I have two Rena xP1 canister filters (on 29g and 30g tanks) and really like their low maintenance, ease of use and quality. I just clean them once a month and they run like champs. I also got the Rena Smartheater that functions as an intake for the filter. You can find more information about the filters here http://www.bigalsonline.com/BigAlsUS/ctl3684/cp17289/cl0/?viewType=Manufacturer&attrib_search=Y&attrib_cnt=1&attrib_id_0=2011&attrib_value_0=Aquarium%20Pharmaceuticals.