Dumb question perhaps, but how do I know if I need the KR618 (6" chamber) or KR818 (8" chamber)? This will be for a mixed reef, total system volume of about 300 gallons.
https://www.geosreef.com/product-category/equipment/reactors/kalkwasser-reactors/
@geo
https://www.geosreef.com/product-category/equipment/reactors/kalkwasser-reactors/
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