Depends if this is your first time using GFO. If it is and you use to much it can strip phosphates to quickly and cause RTN in SPS. Thus it is best to start with a little and work up to the recommended dose.
Depends if this is your first time using GFO. If it is and you use to much it can strip phosphates to quickly and cause RTN in SPS. Thus it is best to start with a little and work up to the recommended dose.