Increase the overall filtration power of your tank by adding these two Genesis Rocks and using our bacterial supplement Polyplab Genesis. - Includes (2) Genesis Rocks, (1) Bottle Genesis Bacteria- 23,000+ Additional Square Feet of Bacterial Space...

Increase the overall filtration power of your tank by adding Genesis Rock to your system.  - Designed For Fresh or Saltwater Aquariums- 23,000+ Additional Square Feet of Bacterial Space For Each Rock- 2 Rocks Included in Set- Reduces Phosphates and...