Modern power filters with their small cartridges, foam pads, and spinning or whirling gimmick devices, will never be adequate for proper biological filtration, in spite of the misleading and exaggerated claims made by some manufacturers.

Under-Gravel Filters: This was the first true biological filter invented for the aquarium. The gravel in an aquarium is suspended above one or more plastic plates, which are equipped with “lift tubes” that extend vertically from the bottom to the water surface. Air is pumped into the bottom of the lift tubes and rises up the tubes, carrying water w

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