You are welcome sir. The most important thing to prevent or battle ich is make sure you don't expose your fish specially the tangs to any kind of stress. The Garlic Xtreme works for me when I had the same outbreak. It also depends on how bad the outbreak is or the stage before you notice it. If the same thing happens again, remove the one with the 1st sign and treat it in QT. If the others can not be accommodated in the QT you have no choice but double or triple the Garlic Xtreme application as long they can still take it. Continue the garlic for more than 2 months or as long as you can. The key is, if the ich can not attach to a host they will soon starve or can not multiply and they start dying.