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Title: Powerful but very noisy
Review: I bought the penguin 350 for my 40 gallon breeder African cichlid tank for the extra flow but this thing made all sorts of vibration noises. I took it apart to find that the impeller magnet was chipped in multiple places. So i returned it (Amazon has great customer service) and bought the aqueon quite flow 55/75 ...ive used them in the past and they are extremely quite for a HOB because the impeller motor is solid state and its in the tank water. Marineland has seemed to drop off on the quality over the years. At least my Marineland tank is still kicking it.....Knock on wood
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