Paulip
New member
I am cycling a new tank with liverock. As a matter of experimentation (and the fact that my RODI isn't setup) I decided to use GFO on Chicago tap water.
The BRS calculator suggested 3 TBS for 12 gallons, effective gallons after rock and sand which I placed in a media bag at the top of my media basket. I have filter sponges in the lower chambers to catch fine GFO sediment. I am shocked that the phosphates went down from .50ppm to 0ppm in one day. (API test)
The water is obviously getting stripped of other nutrients. It doesn't seem to be a safe dosage. How much do you guys use if any?
The BRS calculator suggested 3 TBS for 12 gallons, effective gallons after rock and sand which I placed in a media bag at the top of my media basket. I have filter sponges in the lower chambers to catch fine GFO sediment. I am shocked that the phosphates went down from .50ppm to 0ppm in one day. (API test)
The water is obviously getting stripped of other nutrients. It doesn't seem to be a safe dosage. How much do you guys use if any?