This sponge filter is great like most others. If you find the bubbles are too loud, you can cut out the inner plastic and route the air hose to the air stone in the filter. This makes the filter quieter and actually creates more buoyancy in the water. Find a suitable PVC pipe, cut it to fit from your filter to just below the water surface, slide the crank over it and you now have a filter, air source and water jet to improve water flow in your aquarium.
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