Over the last few weeks I've noticed some SPS bleaching in my tank. I've been pretty busy lately with a lot of projects at work, plus the birth of our first child, so the tank had to go on autopilot for a while. About the only thing I have been doing regularly for the past two months was replace top off water and feed the tank. So tonight when I went to get more top off water, I checked the TDS. The TDS coming in was 373. The TDS coming out was 356. And then it all clicked. ...
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