I am certainly no expert, but...
TDS = Total Dissolved Solids (ie minerals). 210 ppm (parts per million) is quite high and certainly wont help prevent a bloom!
What I wanted to say is where I get my water - As I don't have a RO/DI unit, I get it from the Alternate Water store. They have RO/DI water treated with Ozone, and it is only 35$ for 11 x 5 gallon fills. I have heard that Victoria water is 'very good' and would think that using dechlorinated tap water would actually be better then using the mineral water.
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