I had some mixed problems lately: SPS browning/base recession/STN.
ICP from Triton shows
Al 215 µg/L
Sn 16 µg/L
Besides water changes, they suggested to use GFO (namely ROWAphos) to deplete Aluminum.
Whether GFO can actually remove Al or not, I don't know. However I used to have very low phosphate (6 ppb phosphorus) and now I'm at 0.
Solutions:
1- Keep GFO, dose K2HPO4 to taget .03 ppm phosphate
2- Keep GFO, do not dose phosphate
3- Remove GFO
Overfeeding is not an option. I have high nitrate from previous overfeeding. This is another reason IMO to dose phosphate as they will likely be the limiting factor for nitrate uptake.
ICP from Triton shows
Al 215 µg/L
Sn 16 µg/L
Besides water changes, they suggested to use GFO (namely ROWAphos) to deplete Aluminum.
Whether GFO can actually remove Al or not, I don't know. However I used to have very low phosphate (6 ppb phosphorus) and now I'm at 0.
Solutions:
1- Keep GFO, dose K2HPO4 to taget .03 ppm phosphate
2- Keep GFO, do not dose phosphate
3- Remove GFO
Overfeeding is not an option. I have high nitrate from previous overfeeding. This is another reason IMO to dose phosphate as they will likely be the limiting factor for nitrate uptake.