That's not such a good idea. It actually stimulates it to multiply if even the smallest amount gets left behind. Kalk is safe, so is vinegar. Vinegar actually stimulates growth of beneficial bacteria.
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I've grown sps, lps, clams and softies under PC's. You should look into feeding your corals. That's what makes them grow. There's nothing that states how fast a coral should grow; coral growth depends on many factors.
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