[caption id="attachment_2907" align="alignnone" width="300"] All the water in the tank needs to run through the filter every four hours.[/caption]
Filtration
A filter is essential to keep your water clean and the fish healthy. There are many options available but a good choice for a beginner is a bio wheel system. The size of your tank must be matched by the size of your filter if it is to be effective. Filters come with varying flow rates, but ultimately your tank water needs to be filtered at least four times every hour.
As an example, if you have a 25 gallon tank you will need a filter with a flow rate of at least 100 gallons per hour.
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