That’s without RO. I heard anything under 300 tds is fine for FOWLR. I’ve watched many people with higher TDS succeed. I mean, how many people had RODI in the 60’s? Let’s be honest. Is it really necessary for hardy fish with macro algae? I added a pulsing Xenia into the 20 tds water and it’s opened pulsing and looks great…. I read people had great experiences with Xenia and tap water (they like not pristine water) apparently?
I’m adding green chromis which are apparently hardy.
https://www.bcaquaria.com/threads/bcs-tap-water.109666/
People here from the greater Vancouver area claim success without RO or RODI…
I mean, really what is the threat if the fish are fine and even a coral is ok? Are we perhaps over thinking? Maybe that’s why dinos have taken over the hobby, we make things too clean and don’t believe hardy fish and corals can adapt?