I am using the garlic xtreme and the fish seem to love it. I am not convinced it "soaks" into the brine shimp as well so I have been dripping it on flake food to feed supplementary to them. Not to get off the topic but I checked out your tank in your signature thread, have to say it is about as slick as can be! I started my own thread about the hippo tang, if anyone helps on that subject it may help you out as well:
http://www.reefcentral.com/forums/showthread.php?t=2391031
if your at week w/ copper, and everyone is clear except a few scars on the hippo, and they are all eating well.... keep the course, they will be fine