So I’ve been trying to utilize GFO in a reactor with carbon to bring down my phosphate levels from .35 to .15. I’ve picked up some Rowaphos and using half the amount, it dropped to .25 in a weeks time. Did another round and dropped it to .15 successfully. The problem appears with some of my SPS seem to get burnt tips, and two rather new wild Acro colonies have completely RTN’d.
I’ve had this issue in the past and avoided GFO but then of course phosphate levels rose and growth seemed to slow down. I’m stumped to why this is an issue in my tank when others run much lower phosphate levels with GFO successfully. LPS have no issues. Do I maybe need to lower alk to 7.0 to curb burnt tips/RTN? I’ve heard some tanks just need to run lower alkalinity.
Current Parameters:
Alk-7.6
Nitrate-20
Phosphate-.15
Mag-1320
Calcium-420
PH - swings from 7.95-8.2
Average PAR for my SPS is around 250, lit with dual XR30 G5’s at 55%. I’ll attach my lighting schedule and percentages as well.
I’ve had this issue in the past and avoided GFO but then of course phosphate levels rose and growth seemed to slow down. I’m stumped to why this is an issue in my tank when others run much lower phosphate levels with GFO successfully. LPS have no issues. Do I maybe need to lower alk to 7.0 to curb burnt tips/RTN? I’ve heard some tanks just need to run lower alkalinity.
Current Parameters:
Alk-7.6
Nitrate-20
Phosphate-.15
Mag-1320
Calcium-420
PH - swings from 7.95-8.2
Average PAR for my SPS is around 250, lit with dual XR30 G5’s at 55%. I’ll attach my lighting schedule and percentages as well.