buffering ph by adding minerals

|| about the co2 level; i do not inject co2, there is an air pump
|| running (which should have the opposite effect i think). The ph and
|| kh only start at those values, they soon fall to much lower levels.
|| for 2 years there was no problem, its only recently started happening
|| (co-incidentally at the same time i started getting a lot of snails,
|| i wonder if they could be robbing the water of bicarbonates?)

Not likely...

|| i have tried bicardonate of soda, the ph and kh still fall, they just
|| start from a higher value, i tried evian too, with the same result.
|| i think i should get some coral, then as it dissolves there will be
|| more 'in reserve'
||
|| chris

I'm leaning towards a bad test kit... how old are they?

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