The "light blue precipitate" you saw when using Redline Water Wetter is some kind of silicate which is usually white, I believe. It turned blue because some of the anodization on your reserviour is being washed off which dyes the water slightly blue. Water Wetter, Zerex, etc all have anticorrsives which should help considerably. The anodization alone will not stop the corrosion, but if you keep an eye on it and change your water somewhat regularly, I think you'll be okay for quite awhile.
FWIW, automotive aluminum radiators do not have anodization, and run fine for years with antifreeze and distilled water in a mixed-metal system (assuming the coolant is flushed every couple of years as it should be anyway during regular maintenance).
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