I have a 55 gallon aquarium with a couple of fish in it. I have a Rena Filstar canister. But, I was looking to suppliment my canister filter with a HOB filter. I do not think there can really be too much filtration. I was reading some reviews on some HOB filters and I am confused. If people say something is "noisy", I cannot figure out if they are refering to the motor humm or the splash/waterfall noise. My brother has a Penn Plax HOB on his aquarium and it does an amazing job. But since his aqaurium is smaller, I do not know if the Cascade 300 would have a loud motor soud. I am concerned with the motor noise because it is in my bedroom. I like the waterfall noise as long as it is not too loud. I guess I really do not know about these things.... So, what would be a decent HOB filter to supplement my canister filter?