Mixing top-off water?

nteague

New Member
I am going to top off my reef tank with a Seachem Reef Builder
mix of RO/DI water on every other week, and then Seachem Reef
Advantage Calcium RO/DI water on the other weeks. Should I
mix the powders in the RO/DI water just before I top-off, or
should I mix them in at the beginning of the week? I am not sure
whether or not the powders can go stale sitting in the water all
week. Thanks!
 
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