Careful that your Dowflake is not made after December 2005 - as it has 7500x times the amount of bromine in it, which at this point in timeis is unknown on the effects for 2 part dosing regularly. Water changes should be fine apparently.
Magensium Sulfate (Epsom Salts) can accumulate as well - try to get a blend of Magnesium Chloride AND Sulfate. PM me, I know of sources to find it for under $2 a kg USP Food Grade locally.
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