Can I dose magnesium and alk in the same day ?

I'm going to assume you're using some sort of two part? You don't have to wait between the two. Depending on what you're allk additive is (sodium carbonate or sodium bicarbonate) those will impact your ph differently but your Ca additive will not. You can dose them together.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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