SO I just bought a used 180 gallon aquarium. I don't have much cash right now and wanted to get a cheap filter to cycle it with then get a larger canister filter later on. I was thinking of the aquegon quiet flow 55/75 because it has a great bang for buck and cost less than 30 dollars and is rated for 90 gallons(yes I know the ratings don't mean much but still.) so I was just worried the filter wouldn't fit on the rim of my 180 gallon. anyone have first hang experience using hobs on larger aauariums?? also the empeor 400 and penguin 350 are rated for less than 90 gallons and cost more but I know that the ratings don't mean much so would a penguin 350 be better than the quiet flow 55 75 that cost less?