Aquariums have had substrate filters for a long time because they work so well. It supports the growth of both aerobic and anaerobic bacteria, which are so important in maintaining an ammonia-free environment for your fish. Be sure to use the recommended size and amount of gravel; usually 1 to 1-1/2 inches deep and 1/4 inch in diameter. Irrespective of the filter method, a regular partial water change using a gravel vacuum siphon is essential for the success of the aquarium!
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