*grin* Haven't had to yet.
The tank's been running all of two weeks (never cycled due to well aged live rock from another tank). Alk, Salinity, Ph, NO3, N04 and Ammonia are all tested every 2-3 days, and all levels have been fine.
I do not test for calcium/mag yet, as I can't see anything uptaking it (yet). Once there's something in the tank which will consume it (again, the corals don't really count, as they're small as all get out, and only been in for 4 days).
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