reduce po4 problem

[kai hen]

My GFO is on the way. Current po4 is 0.53. No3 is 0 I used neonitro to increase no3 from 0 to 0.5 but po4 still no change. Yesterday I did WC and added neonitro again and used red sea nopox. Today...po4 no change but no3 is 0 what should I do...thank you～

 

[kai hen]

My cheato algea stop growing for two weeks.

 

[Randy Holmes-Farley Verified Community Expert]

There is way more phosphate than 0.5 ppm to remove because some much more will be bound to rock and sand. So expect it to take time.