Muddy
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The crushed dolomite lime should also work. It will take a few days before you see a difference in the pH. As to your seedlings dying, are the stems getting thin and brown right at the soil level? If so, it's called damping off. Mix 1 tablespoon of 3% hydrogen peroxide to 1 quart of water and spray them twice a day with it.
https://www.autoflower.org/f42/damping-off-causes-treatments-1946.html
https://www.autoflower.org/f42/damping-off-causes-treatments-1946.html