Dosing phospates no results

[marcogig]

Hi all,
I am dosing PO4 because the level was consistently zero and dinos appeared.
I am losing some sps and lps, so I'm trying to stabilize nutrients. No3 from 0 are now 2.5 and PO4 are still 0 (hanna ULR). I'm dosing Aquaforest PO4 PLUS 1,3ml for 7 days. What is the right strategy in your opinion to reach a minimum value? Increase the dose or other?
I have a RS 170G2 started about 2 years ago.

Thank you

 

[Saltyreef]

Keep it steady what you are doing. Something is consuming it and i have a feeling its your LR and substrate. A member here gave a good anology of "the glass ketchup bottle effect".
Nothing, nothing, nothing, BOOM....theres all the ketchup.....

 

[Randy Holmes-Farley]

I am not familiar with the concentration of that product.

How much in ppm are you dosing daily?

It can take a huge amount to overcome rock and sand binding.

 

[Dan_P]

I am not familiar with the concentration of that product.

How much in ppm are you dosing daily?

It can take a huge amount to overcome rock and sand binding.

I suspect microalgae consumption is also a consumer of phosphate and that it might remove the same amount that aragonite binds. To bad the op has coral, otherwise we could see if the phosphate consumption declines with no illumination

 

[komachi253874]

It's possible your microorganisms have been chronically starved, resulting in a low population size. When nutrients are reintroduced, microbial reproduction consumes a large amount of phosphate. Additionally, under prolonged low nutrient conditions, live rock and sand will release solidified phosphate, which they will also absorb until saturation. I once added 0.06 ppm of phosphate daily for two consecutive months before the Hanna774 reading was no longer zero.