Finnex External hang on box refugium for my 40G reef tank

Finnex External hang on box refugium for my 40G reef tank. Here's our review of this hang on box by Finnex.  It is a multi purpose hang on box. We are using it as a refugium. See how we set this up with sand, rock, and Chaetomorpha macro algae for maximum biological filtration. If you have this product and are using it please feel free to share what you think about it. Also, please feel free to share other similar products that compare. Thanks for watching.

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• #finnex
• #filter
• #reef
• #refugium