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IO tests lower calcium than RC, but not much.
Nothing in that tank should be consuming calcium down to 320.
When you use the salifert test kit you need to keep adding titration solution until it turns full grayish blue, not purple. Most people tend to under read the Salifert test for this reason.
Nothing in that tank should be consuming calcium down to 320.
When you use the salifert test kit you need to keep adding titration solution until it turns full grayish blue, not purple. Most people tend to under read the Salifert test for this reason.


