Tank Transfer is only important to people who believe their tank can be ich free. If you believe ich is always in a tank, tank transfer is useless to you. Tank Transfer exploits the life cycle of ich. As the ich feeds off your fish, it later enters into a different life stage, where it falls off the fish and multiplies before the offspring reattach to your fish. If you transfer your fish to a new ich free container before the ich enters its next life stage,...ich cannot complete it's life cycle and reattach to your fish. More info here/success stories here: http://www.reefcentral.com/forums/showthread.php?t=1996525 Rich Ross mentioned it was a viable method (if you do it correctly) for dealing with ich at the December talk.