what the hell happened

Fireplug

Reefing newb
Ph 7.8
Nitrites .25
Nitrates 80

Did a water change three days ago. Tested today. Used the water at one of those fiil sites. Suppose RO. Week and a half ago it was ok.
 
If you get water from that site again make sure to test it before you mix your salt in. They may have not changed the filters in the machine in a while. Also, have you done/moved anything around in your tank recently?
 
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