Reef Aquarium Fact #181 Granular ferric oxide (aka gfo) is great for keeping your phosphates low.

[revhtree]

We are going to continue discussing the reef aquarium facts submitted by our members. Do you agree or disagree? What are your thoughts?

Fact #181


Granular ferric oxide (aka gfo) is great for keeping your phosphates low but it can drop your alk when first added. As with most supplements, start with a low amount.


True or False and what do you have to add to this subject? Please share your photos as well!

 

[ritter6788]

I think you should start with a low amount but I haven't experienced an alk drop when using it. I have run into issues with using too much too soon and stripping phosphates too low. Gfo is very good at what it does!

 

[Young Frankenstein]

No the great way is a refugium and natural ways of exporting phosphates.

 

[CJO]

It definitely does a great job of binding phosphates. Also, be sure to wash it thoroughly before use.

CJ

 

[Chameleon]

I have tried gfo and didnt like it as coral started losing coral coloration. I did use it after setting up a new tank to decrease algae bloom, but tend to stay away from it. I wander what might cause it to lower alkalinity