Which Seachem product are you using? Reef Complete? And your leaving the reactor off for now?
If it is still running is the Zeomag you have in your reactor a type of Dolomite?
If it is this might apply
Quote:
It has been suggested that adding dolomite to CaCO3/CO2 reactors can help with magnesium problems. Dolomite is a material that contains both magnesium and calcium carbonate. If dolomite is added to the reactor to maintain existing appropriate magnesium levels against their continual depletion via calcification (for example, if the calcium carbonate used is too low in magnesium to maintain adequate magnesium), then this is a fine approach. Aquarists might typically use on the order of 10% of the media as dolomite (and 90% as calcium carbonate).
However, this method is unsuitable if the goal is to raise magnesium levels. The problem is that for every magnesium ion released from the dolomite, two units of alkalinity are also released:
MgCO3 à Mg++ + CO3-- Consequently, raising magnesium in this way by 100 ppm will necessarily raise the alkalinity by 8.2 meq/L (23 dKH). The only way around this problem is to add a mineral acid (not vinegar) to the aquarium to reduce the alkalinity, and that may be more problematic than just adding a magnesium supplement in the first place.
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http://www.reefkeeping.com/issues/20...f/index.php#10