Does red slate raise your KH ?

Jersey Scape

Junior Poster
Nov 21, 2005
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Rutgers U. NEW JERSEY
My tap water has 2 Kh before I put it in the tank. Recently I have noticed my Kh starting to go up. Two days ago it was at 4 Kh, yesterday at 5 kh and today at 5.5 Kh. I am not sure how that is happening but I do have some red slate that I collected about 10 years ago. It has been in all my tanks so I just threw some in this one. This is a brand new tank that was set up about a week and a half ago with ecocomplete, 3.66wpg, EI fertilizing, Co2 injection.

Should I be concerned?

Thanks