Its been 2 years that my shrimp stop breeding and started dying.

Nothing has changed for the past 2 years except i do notice the ph started showing different values.

With my no-brand ph pen, it shows my ph level 7.1, if i test it again after like 1 min, it show 7.2. If i test it again after another min, it show 7.2. So after 3 test, i presume it is 7.2. Using sera buffer solution, my ph pen reads 7.

Using sera ph liquid tester, it shows ph 5. So the prob now, if i test my tap water, both give my the same result of 6.8 (sera colour is in between).

So which do i trust?

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