Does copper affect ammonia reading?

[arturoo1977]

Hi all. Thats my question. I have a QT with very low copper levels from a past treatment (couple of 50% water changes since then) but Im reading some ammonia 0.25ppm
Yes, Im using API kit, but same test in my DT reads 0ppm.
So, does copper can affect ammonia readings? Or I have ammonia in my QT?
Thanks

 

[SteveEreef]

Yes. But a Sechem ammonia alert badge will work

 

[arturoo1977]

Thanks
Nitrites are 0ppm and Nitrates about 10ppm, in QT.
This setup has been running for about 3 weeks with a sponge and rock rubble that were at DT for 2 months prior to use them in QT.

 

[arturoo1977]

I have just made another 50% WC, just in case.