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Don't know about the calcium. Actually, I have used Joe's without ever taking the rocks out. Just use a syringe and you will get the job done. The only other issue is to make sure you do not kill too many at once. I am told that can really screw up the water chemistry. I have tried to only kill off 3 or 4 at a time with no ill effects so far.
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Check out the little red house for directions to my tank journals.
John Martin
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