My alk has raised from 8.5 to 9.8 on its own I’m about 2 weeks. no water changes or dosing during that period until today which dropped it back to 9.3. I’m using the Hanna checker and even bought new reagent to make sure it wasn’t that. I also tested with Red Sea and got the same results. 30 gallon tank with a few sps. Calcium was a little high(525) and nitrates are 0 with a 1.025 salinity . I don’t want nitrates at zero and was curious if that has anything to do with it? New to posting on here but follow the forums. Any info would be greatly appreciated! Thanks