vetteguy53081
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depending on number of corals, the absorbtion rate will be high enough that additives will be necessary.I was trying to answer that question. With regular water changes there shouldn't be a need for an additive at all. Especially before corals and their consumption. Until you have a lot of corals that won't be a problem.
As for 50% water change, a person with a 200 gallon tank is not going to change 100 gals bi weekly or in my case, with a 660g tank change out 300+ gallons. I have a CA reactor and still dose mag and other liquids.

