Ya use Garlic. my tank had ICk a short while ago but only my tangs had it (my unicorn and my brown tang didnt have it as bad as my Hippo he was covered)
I grabbed a fresh glove. mashed it up spread it on some nori anmd then wrapped it on the PVC I have in the tank with the garlic on the inside (I made sure there wasnt alot of garlic bits but a few) within 24 hours ick was gone.
I know there has been talk about this working or not working.. I have used garlic in my fish food for a long time a friend of mine in New Jersey who used to breed Discus used it all the time in is food to help with internal parasites and worms.
If worse came to worse your fish were already seasoned for the fry pan (KIDDING ONLY KIDDING ) 
Jim
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 3x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, Blue LEDs) Vertex Calcium Reactor 2x Deltec Pellet Reactors
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