I used to raised/bred Discus, the most sensitive fresh water fish that you could ever keep. Most discus keepers use RO/DI as discus is very sensitive to Chlorine and Chloramine, however based on my experience water here at the Lower Mainland is almost pure and Chlorine is the only thing that you need to watch out during Winter/Spring months.
A pinch of Prime during Winter/Spring time is all I use.
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