I always thought that the calc and mag kits were easy to see the color change, the mag test especially. So the calcium kit is a lot different now? I don't test calc often as I dose 2 part and just measure alk often with the Hanna checker.
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After about a 16 year break from fish keeping,
Wow, how things have changed.
Current Tank Info: 90g, mixed reef, I hope haha
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