P04 making corals unhappy

[Reef Pilot]

Yup, before I got my Hanna Phosphate Checker, I too, thought my P04 was OK. I first brought my N03 to zero with my bio-pellets and MB7, and then finished the job with my GFO reactor to get my phosphates near zero as well.

I think the live rock and sand do hold P04, and of course with feeding, you are always adding more. Only way to get it down all the way is with GFO or a similar product.

BTW, I used to run a refugium full of Chaeto, and it barely made a dent in my N03 and P04. Maybe it works to help keep it low once you have it down, but it sure didn't do much for me when both N03 and P04 were high in my tank.