URGENT -ick!

[naesco]

I would not consider putting chemicals in a reef tank. You had sucess with the garlic, continue. You need to feed just garlic soaked food for a couple of weeks. The garlic likely killed the ich on the fish but was still in the water.
Place a large piece of garlic soaked nori on a small rock secured with a rubber band and place it near where the kile is hiding. Keep the yellow occupied with garlic soaked food on the other end of your tank. Keep the lights off except for feeding.
If it will still not eat you have to consider a dip (like Dipex), a freshwater dip or a QT with Greenex or Tetra Medica Marin OOmed.
Good Luck