I got off track and started a whole other discussion on someone’s post oops. Anyway, so I started to top off with distilled water when I accidentally spilled my bucket of fresh RODI water/used it all, and it dropped my calcium and magnesium levels, etc., to critically low levels. I even talked to my lfs about this and started adding Reef Complete to my top-off water, and everything has been good. After doing some further reading, it’s recommended that remineralize distilled water most mentioned freshwater because the water is too pure, but I did read some articles about adding minerals to distilled water in a reef tank. Others have mixed things to say. Please note I’m referring to top-off water, not saltwater which has the added minerals in the salt mix. Does anyone else do this too? Thoughts? And I’m aware RODI water and distilled are both pure forms of water. This is based off my personal experience and some reading.