Nitrates after tank swap

[kanshi]

I just had to do a tank swap due to seam issues on my old tank.
New tank, new sump, 100% new water, new sand rinsed to clear, moved live rock into buckets of tank water then straight into new.
Tank seems great all fish are doing great.
Took water to get tested. Nitrates and phosphates are high. I know the phosphates can be leaching from the live rock, but why are the nitrates high.
Thanks

 

[JohnL]

Welcome to Reef Central. Did you test for nitrites? If they are present, then nitrates will show a false high.

 

[kanshi]

It's a well established tank. No nitrites no ammonia.

 

[mellotang]

You might have had some bacteria die off on transfer

I wouldn’t stress too much
I’m sure in time the tank will re balance

 

[kanshi]

You might have had some bacteria die off on transfer

I wouldn’t stress too much
I’m sure in time the tank will re balance

Thanks

 

[reefing102]

I agree. Likely just some slight die off