How long should I wait after adding Phosphates or Nitrates to recheck levels.

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ScottB

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Both will show up pretty quick. Nitrate can hang around a while before being consumed by bacteria and coral.

Phosphate is a bit different. In a depleted system, the added PO4 will be quickly bound up in your depleted rock and sand (aragonite). So testing shortly after addition may show some residual, but some hours later it will all be bound up. This pattern continues until the rock and the water are equally saturated.

When both are depleted, it is my experience that nitrates are easy and quick to rise when dosing. Phosphates require MUCH more dosing, easily 5:1 depending on the solution concentration.
 
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lelandmarine

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Both will show up pretty quick. Nitrate can hang around a while before being consumed by bacteria and coral.

Phosphate is a bit different. In a depleted system, the added PO4 will be quickly bound up in your depleted rock and sand (aragonite). So testing shortly after addition may show some residual, but some hours later it will all be bound up. This pattern continues until the rock and the water are equally saturated.

When both are depleted, it is my experience that nitrates are easy and quick to rise when dosing. Phosphates require MUCH more dosing, easily 5:1 depending on the solution concentration.
Thanks
 
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