Po4 slightly high, large water change or gfo?

[Bustyraker]

Been testing more and more often lately and have noticed my po4 creeping up. It's stilling at .043 right now and I want to bring it down between .03 and .02. Would gfo bring it down too rapidly? Or will a large water change even make a difference?

 

[saltyfilmfolks]

WC won't effect po4 much by its nature of binding to rock and sand.

Start slowly with the gfo and you should be fine.

 

[Randy Holmes-Farley Verified Community Expert]

Right. A 100% change won't drop it 100%.

You can use as small an amount of binder as you want.