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Lower Magnesium with Instant Ocean Salt

Reefer37

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Has anyone else noticed having to supplement a bit of magnesium between water changes with Instant Ocean salt?
I've noticed on like the last 3 water changes my magnesium level dipping below 1300 almost every time. This last time I did a larger water change due to increased phosphates and it's down to almost 1200. I recently started using IO, so not sure if this is just something that comes with this salt or what.

Would like to hear other people's experiences or recommendations!
 

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