GFO ??? I'm new to this hobby

[jordannkids]

I'm new to this hobby what is it when people are taking about GFO and what does it do for my tank ????

 

[ytro82]

Granular Ferric Oxide - It's a media used to remove/reduce phosphates. Usually tumbled in a reactor.

 

[Coastie Reefer]

Granulated Ferric Oxide. It's used to reduce phosphates.

 

[JBradford]

GFO is granular ferric oxide. It's basically pieces of processed rust that you can put in you filtration system, I use a reactor which I think is most common, and it helps to filter out phosphates from your water. High phosphates can lead to algae production. The short and sweet explanation.