something wrong please help

well i found the problem its my test kit its three years old i threw it in the trash and bought a new kit now my test show 8.2 and for the prob i took it back and they said something was wrong with it so i got a new one and it shows 8.1 so all this time i had no idea that test went bad and ive been but tons of stuff in my tank trying to fix a problem when all ive been doing was creating a problem so thank for all the help
 
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