High phosphate

[Texas_Ranger]

Some of my coral have been closed up, I check my phosphates and they were at .52 with Hanna checker. What is the quickest way to reduce phosphates? I just did a 50% water change and dosed waste away. Now at at .37

Thanks

 

[ninjamyst]

Your corals may be not closed because of high phosphate. What are your other parameters? Make sure to lower phosphate slowly and not introduce too much change at once.

 

[Lavey29]

Water changes do basically nothing to lower phosphates because it is bound in rocks and sand.

 

[bushdoc]

You might consider using Lanthanum chloride ( do some research how to do it if you decide) and then if your phosphates keep raising up, I would use GFO in media reactor or/and refiugium.
As others noted, lower phosphates slowly and never to 0.