so i bought my first marine tank a couple months go after a year researching saltwater tanks...i got it off craigslist its a 75 gal came with 150lbs of liverock alll the filteration ect. now i have a yellow tang two perculas and a blue hippo..when i bought the tank he gave me a bunch of stuff and one of them was garlic extract? i think its called and i forget what he said it was for anyone no what i would use this for? the only reason y im asking now is because when i first introduced my blue hippo tang he had ick my skunk shrimp took care of it and ate it or w/e then all of a sudden it looks like he got it back now so i was trying to see how to treat it and i do remember him telling me the garlic has something to do with disease or there immune system. if anyone can help me out i would aprecaite it thanks