All bioballs are is a surface area in the system for bacteria to grow and process wastes such as ammmonia and nitrite to nitrate. Their presence as such doesn't limit you to what you can keep in the aquarium. They are simply acting as the biological filtration. However, depending on how the system is maintained, there is a possibility that nitrate levels will be elevated. And generally most corals will grow better and be more healthy with undetectable nitrate levels.

For further information see [url=http://ozreef.org/content/view/110/28/] Do I need a trickle filter?[/url]

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