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I've had aiptasia destroy garden / show tanks in short order. Also, vinegar works just as good as kalk paste and is easier and more convenient to work with.
IMO, I avoid closed zoas, even if free. If they are too far gone and start melting they'll release toxins that could aggravate other zoas. Plus, you don't know what's aggravating them and you want to introduce them to your main tank? At best I'd quarantine until they open.
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