Just realized I have a sample of Mosura Rich Water lying around. I'm setting up a 120 gallon softwater tank and am wondering if it'd be helpful (i.e. does it actually do anything). Also, from the direction on vendor sites I've found online it says to dose 1 flat scoop per 20 liters, but I don't have that available (I assume its included when bought in the bag). Does anyone have another more practical way of dosing it?