How to know what size powerhead to use?

  • We are currently upgrading MFK. thanks! -neo
In many of the areas where I snorkeled in the Yucatan, the flow is constant and rises from the subterranean caves, it is like a moving wall of water, not violent but very strong. The cichlids easily move in and out of it by hugging the sides, fallen logs, and rocks.
 
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