This depends on magnesium, are you buffering or running zeomag?
Either way, I would choose option 1, or option 3, depending on your parameters and how you prefer to dose.
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Perry
"Anger is like drinking poison and expecting the other person to die" ~Buddha~
Current Tank Info: 50 Gallon AIO Cube, Aquamaxx WS-1 Skimmer, LED/ Hybrid 4x24 watt t5
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