Hex shaped box holding 3 PODs. These pods can be used in nano tanks, as habitats for copepods, or even inside a tank.  They would look great with corals growing on them. 

MarinePure is designed to be a substrate for bio-filtration, specifically to target ammonia and nitrite removal (nitrification) and to minimize nitrates (denitrification). MarinePure is suitable for both freshwater and saltwater (marine) environments. MarinePure can be used fully submerged or in trickle/shower filters. It should not be used in moving bed filters.

Features

• Light Weight - bulk density 0.3-0.5 g/cc
• High Surface Area - 1.3 - 1.7 square meter / g
• Open Pore Structure - 80-90% Open Porosity
• Chemically Inert
• Hydrophilic - Adsorbs water and stays wet longer
• Low Pressure Drop
• Unaffected by ozone