high phosphate in old tank

[michael guenther]

the biggest problem with rising phosphate is in older tanks over 5-7 years.
high rang of phosphate can be treated only efficiently with lanthanum, from my experience.
the reactor that i build do not let the precipitants get in to the water.
the question is, if except the precipitants if there is other damage except those

[bertoni]

As long as all the precipitate is trapped and the phosphate level is dropped slowly, the tank should be okay. What is the level now?

[karimwassef]

True. Take a few weeks of slow dosing.

Many coral that have adjusted to high phosphates can get shocked when the level drops very quickly.

I took in several damaged pieces from a fellow reefer who's tank had been neglected for a year with high nutrients. Most did well and immediately started to grow on my rocks, but some died suddenly in the exact same conditions.

[michael guenther]

thank's, after measuring the first 2 days, it drops from 1.40 to 0.79, now after reducing the amount of lanthanum, after 3 days it is 0.72.
can be an influence on calcium and alk. because it drops a little?

[michael guenther]

thank's, after measuring the first 2 days, it drops from 1.40 to 0.79, now after reducing the amount of lanthanum, after 3 days it is 0.72.
can be an influence on calcium and alk. because it drops a little?

[karimwassef]

Big drop. Watch for any zebrasoma tangs breathing heavily. My purple was very sensitive.

[bertoni]

Lanthanum chloride can precipitate with carbonate, so it can drop the alkalinity. I'd keep up the lanthanum, but I'd drop the dose to ⅓ or so of the current dose, and see how that goes.