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Wow! Well, one could suggest GFO in this case. But you want to add it slowly. Start with half your system volume per gram of GFO. Once the PO4 gets to a more comfortable level like 0.10 or less, maybe get an algae scrubber. You don't want to deplete all po4 as the nutrients are beneficial.they are at 0.30. ALk is at 8. I have tons of macro.
Hi,
To answer your original question, you can use either Ultra PowerPhos or Ultra Phos 0,04.
Our 0,04 mix will reduce PO4 levels and maintain it at 0.04mg/L until the media becomes exhausted. As mentioned earlier, having some traces of PO4 is desirable as it is one of the food sources for your coral.