By the simplified version there are many types of filters used for the tropical aquarium which can be scored by approximate number of three-inch fish the filter will support, media capacity, ease of cleaning, cost, and appearance:
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4. Temperature, pH, KH and GH
The water values of the water in which fish swim is of course very important. But the water values such as Temperature, pH, KH and Gh are not nearly as important as people make it out to be.
