The filter media supplied with vacuum will not filter out fine debris and bring it back into the aquarium resulting in severe turbidity in the aquarium. It also has to be cycled on and off frequently as fine particles of gravel clog the screen and stop suction. When it turns back on, it empties fines from the filter chamber back into the tank. I remember the old fine earth litter you used to rent from the pet store and it worked great but you can't find it anymore.
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