Corailine- You're saying that by dropping the salinity I will have to recycle the tank all over again? I heard that it wont have to. However I heard it will supress bacteria growth. Different type of bacteria thrive and some die at different SG levels. If you take the SG down to 1.008-1.009 the therapeutic SG to kill MI you will probably have some die off and a possible ammonia spike. Please google "hyposalinity and live rock". Hyposalinity is best done in the QT, and never with copper, one or the other never both. Remember that if you do hyposalinity you must raise the SG very slowly over time, fish handle going hypo much better than moving the SG in the other direction.