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Do you use R/O and/or DI filtered water for top-off and water changes? Have you checked the output water from these filters to make sure they're still working OK?
I had a similar problem and finally tracked it down to my R/O filter had stopped working, which then exhausted my Di resin. So the water I was using to replace evaporation and for my water changes ended up being no cleaner than straight from the tap.
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...If I only had better lighting and a skimmer upgrade and a refugium and...
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