what is the amount of Granular Ferric Oxide needed?

[Jeff]

Hi, I was just wondering how much of the Granular Ferric Oxide product I would need to run in a heavily stocked 58 gallon tank? I use only hi-grade food btw (Rod's, Dt's, etc...).
I use a bag now but am considering using a reactor soon. My phosphate always register 0.

Thanks in advance,
Jeff

[Snarkys]

People generally start by using 1 gram per gallon of tank water but many people end up using up to 4-5 grams a gallon when they are more comfortable using the product.

Like anything in this hobby , you are best off starting slow : )