Yellow Tang with Ich

What are you tank params?

I had. My hippo tang with ich as well I use a uv sterilizer, dose with ich attack(which is reef safe), feed mysis with garlic as well flakes and pellets, soak nori in garlic and I got a cleaner wrasse as well. Within a month all ich is gone and there have not been signs of it since the

Edited by Dan9554880 - December 05 2012 at 5:33pm

Ich is a parasite called "Cryptocaryon irritans". It's like your dog having fleas. Your dog will always have fleas until you kill them, regardless of how well you feed the dog, how much you give him toys, etc. Some dogs can tolerate fleas better than others, and sometimes conditions are just right for the fleas to absolutely take over. But...the fleas are still there no matter what.

There are no "ich-killing" in-tank treatments that are reef-safe. You can try boosting the fish's health through nutrition, reduced stress, etc., but that won't change the fact that the parasite still exists. If you want to save the fish, you'll need to treat them in a separate hospital tank.

What size tank is this? Age? Your nitrates are quite high, and this could've induced stress that lowered the fish's immune system.

The tank is about 6 month old, I upgraded from my first 20 gal tank. I have several corals in the tank doing very well. I do believe I caused a great deal of stress to the fish while searching for a missing Jawfish which turned into a rockscape overhaul. I use a canister filter due to space under the cabinet and I have an HOB circulating and helping with oxygen. Both of my fish are still eating good, but the tang just looks bad. I do have a QT but I am afraid I will really stress the fish trying to catch them.

You've already said that all your fish but these two have died due to Ich.  You have a QT tank - why not use it?? If you don't get rid of the Ich in the tank, this is going to be an on again off again problem forever for you.  Your tank may not survive even if you leave it in the tank.  I'd pull them both out and put them in your QT tank and keep all fish out of your display tank long enough for the ich cycle to pass. 

The tank is 46 gallons