If you play with fire you could get burned. Your water could be fine but why would you take the chance? I used tap water for years before buying an RO/DI set up. The first city I lived in was OK (not great, but I was too much of a rookie to realize it). The second city was terrible.
Your tank is off to a great start (no joke) but I agree with the other folks - four months is too early to claim success. With the money and time you have already invested in your tank, you should buy an RO/DI just to be safe. The road to nursing a tank back to health after it runs amuck is agony and can take a year or more. I had to go through it and I almost dropped the hobby before things came back into line.
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Cheers!
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