Lower Magnesium with Instant Ocean Salt

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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!
 
Orphek OR3 reef aquarium LED lighting
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