For 1-3 gallon tanks or pools this small block is a real find and workhorse. It has an average low noise level, powerful intake and modest exhaust (adjustable). Inside the filter, you can customize and even add a ceramic bio-media, and it's very easy to clean and maintain. I personally use a reflective sponge to slow down the turbulence as this device is being used in a 1.5 gallon Betta quarantine tank and the turbulence is a bit stronger for this type of fish. The filter took over a month to "loop" and is therefore a downfall. Minus 1 star. You can't go wrong with the price. Not recommended for tanks larger than 2.5 gallons as they are too small.
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