Iodine bath is use for any new coral added to your tank or an unhealthy coral.dip in a mild iodine based solution as a bio-security measure to help insure that pathogens are removed from the coral,let coral sit for about 10minutes then remove rinse with new tank water and place in the tank as for the bath water has to be discarded.find the iodine dropper in a drug store.place approximately 20 drops in a 1 gallon of the tank water.
Hope that helps.
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