Have you ever tested the TDS of your tap water ?
Maybe your LFS could test it for you
Do you have any on-going algae issues in your 14g ?
If not, you're probably OK without RO or RO/DI, but I prefer to use a system for my water, even though my tap water is only 8ppm
Even if your TDS is lower than ( for example ) 100 in your area, what exactly are you getting 100 parts of ??? Arsenic, copper, sulpher ... there's all kinds of stuff in city water
Just my 5 cents
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