Randy Holmes-Farley
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My Tank Thread
it sounds like I shouldn't be dosing both part C and the 2PART BRS MAG, because when each was described in their respective videos... they were described identically.. "to maintain ionic balance"
Correct, you should not blindly use both at the recommended amounts. They both add magnesium and sulfate for the same reason.
If you are using both, I'd use the Part C at the recommended rate, and the BRS (which is my DIY) only for magnesium boosts when measurement suggests it is needed.
The comment from them about different recipes is also true, but not a big deal in this situation. The optimal relative amounts of magnesium chloride and magnesium sulfate are different in a product only for supplementing magnesium, and a product also used to boost sulfate when used with all the chloride from calcium chloride. Since the Part C does that already, you do not need the high sulfate recipe, but it is not going to matter much in this setting.