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I've tried the vinegar method with a tiny diabetic syringe... no luck. And vinegar or lemon juice may affect your pH/dKH depending on the amount you use and the size of the tank. I'm going to try the kalk method. I hear it works well.
On a side note, will kalk paste damage any corals it gets on..? I have a small one right in between some of my zoanthids, and I don't want to bring down the "Wrath of the Kalk" on them if I don't need to.
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