Quote:
Originally Posted by Aquattro
Pretty sure that test value is wrong. at that pm, your Ca would precipitate. Something in the water could be affecting test results.
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I see your point, I thought the test was wrong too, the test on the fresh batch of water is what got me thinking again.
I hadn't considered something else in the aquarium water could be affecting the results. What that might be is an interesting and a little worrying question though..