My tank phosphate and nitrate are back to 0.0

[didou]

Last month I had a raise in phosphate in my tank for a few reasons, my chaetomorpha died and my filter wasn't working. Phosphate was at 0.3 and nitrate always been around 4.
I reintroduced new chaetomorpha 2 weeks ago, fixed my filter and used some rowaphos too.

The problem is that now I have 0.0 phosphate and nitrate, (last week the nitrate was down to 2.0 and phosphate 0.12).

Is it bad for my corals ? What can I do to raise it ? I tried giving more food but it doesn't change anything. I even dose elementals N from fauna Marin and nitrate stays at 0... Do I take out half of the chaetomorpha from the refugium?
My tank is 1300 liters and my refugium around 100 liters.

Thanks for your help

 

[Randy Holmes-Farley]

It is typically better to have detectable levels. I’d remove any rowaphos, maybe reduce the chaeto lighting schedule, and feed more or dose N and P.

 

[didou]

It is typically better to have detectable levels. I’d remove any rowaphos, maybe reduce the chaeto lighting schedule, and feed more or dose N and P.

Thank you, I already removed the rowaphos, how many hours of lighting do you recommend for chaeto ? Now it's set to 8 hours

 

[WvAquatics]

I would look into Randys dosing ammonia to raise nitrates. Heres the link
Post in thread 'DIY Ammonia dosing for low nitrate systems' https://www.reef2reef.com/threads/diy-ammonia-dosing-for-low-nitrate-systems.987087/post-12856139

 

[WvAquatics]

I just think that forcing nitrates with additions compared to building a strong base of biological filtration end process being nitrates sounds like a great way rather than adding end product just imo

 

[didou]

I would look into Randys dosing ammonia to raise nitrates. Heres the link
Post in thread 'DIY Ammonia dosing for low nitrate systems' https://www.reef2reef.com/threads/diy-ammonia-dosing-for-low-nitrate-systems.987087/post-12856139

Thank you

 

[Randy Holmes-Farley]

Thank you, I already removed the rowaphos, how many hours of lighting do you recommend for chaeto ? Now it's set to 8 hours

Something lower, but not low enough for it to die. 6 h?