Eheim Professional II 2028 Canister Filter $55. I used this filter on a 120-gallon mixed reef tank for approximately ten (10) years and it worked well. However, it began to act erratically (alternating between running and not running for no apparent reason) approximately two (2) years ago. As a result, I replaced it with a new model. So, I'm not sure if the pump head itself is dying, it needs a new impeller, or there is some other issue. It is currently running but is making a rattling noise. If nothing else, it makes a great source of replacement parts for your existing Eheim Professional II 2028 canister filter. This unit measures 16 2/3" tall by 8.5" x 8.5"