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Yes I figured that out today when I came home and my purple coraline was pink. Dang it! My alk is like 4, very low. So I ran to PM and got some reef builder so that should fix that hopefully. I used to have it on hand but I never used it so I threw it away. I used to use marine buffer in my top off and water changes. Then I was told (recently) to switch to reef buffer, so I did. I guess my alk has been bouncing around when I top off. My friend suggested I use marine buffer on top off water, and reef buffer on water change water. What buffers do you use for top off, and water changes? I will recheck alk tomorrow, ph and magnesium still look good right now.
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