Started the hobby with tap water and had Cyano.
The Cyano cleared up around the time I switched to ro/di but by then tank had been up for awhile and I added more circulation. Can't say 100% the ro made the improvement but can't see going back to tap as I have one less variable to deal with.
Now if I was in some areas of the country where the tap water has a TDS of 20, not sure...
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