Garlic and Selcon aren't totally useless, they are very beneficial in improving the health of the fish and that alone helps them fight off ich. I have done a lot of research as well and the active ingredient, Allicin, dissapates very quickly once the oil is extracted from the garlic. I extracted my own oil by taking two whole garlic and squeezing the cloves through a garlic press several times, I then mushed it up some more with a mortar and pestal, finally I poured the pulp in a media bag and squeezed the juice out. This way you have all of the allicin still in there, it will keep for a few days in the refrigerator. I didn't have the luxury of being able to pull the fish out of my 180 so I decided to add two Golden Head Sleeper Gobies to turn the substrate and disrupt the ich reproduction in the sand bed, I also added a Cleaner Wrasse to pick the ich off the fish in the tank. I did not lose one fish and I have not seen any sign of ich since. I have since pulled my Gobies because they did thier job too well and had all my corals covered in sand. My Cleaner Wrasse is still there and doing fine eating small mysis and even eating veggies from the clip. I'm not saying this is the definitive cure but it worked for me.
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