Hey all! Been fishkeeping for around 2 years and only recently started using a buffer because I've struggled with very low alkalinity. Thing is, my API reading KEEPS giving me a different number. By this I mean, today alone I have tested in succession upwards of 5 times and my kH reading has ranged from 3 all the way to 10! WTF is happening here? Did I get a dud kH API test? Any thoughts? Been struggling similarly (though not as severely at ALL) with gH.