Ok first off let me give a small back story, My RO/DI unit is from BRS brand new 6 stage that I purchased earlier this year. I recently noticed 1 of the DI resin was exhausted so I replaced that along with all new pre filters & carbons this week. I did my weekly water change on my 75g (running for 1 year 1 month) and my 32 nano (running for 5+ years) on Sunday and suddenly the last 2 days I noticed my tank getting cloudy. My first thought was bacteria bloom (my nutrients is a tad high on my 75g) however this is the first time I've seen this happening in my nano. I was a bit worried to think that it may be caused by the RO/DI unit, however it definitely crossed my mind despite the fact that it didn't make any sense. Last night at midnight my 225g fresh water tank was a bit low on water in the sump. In that tank I only house 1 arowana and I change water once a month. I topped off maybe 2-3g max and this morning I noticed my water was cloudy too. What are the chances something's wrong with my city's water and what are some recommendations anyone have? I live in Chicago and it's city water. TDS measures basically 1 ppm input and 0 output through my RO/DI unit. Any advice will be greatly appreciated.
Forgot to mention, topped off water for the fresh water tank did not pass through RO/DI unit.
Forgot to mention, topped off water for the fresh water tank did not pass through RO/DI unit.


