Take a baster and blow and suck off the damaged flesh. DONT touch it with the baster. But you could of BURNT the corals with the Kalk. It is not meant to come in contact with your corals in a very non diluted form. (Slow drip in your tank)
Dont do more than a 10-15% water change tonight. It sounds like it was more from the shock from the kalk than anything else. You may put the rest of your tank in shock if you change more than that.
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