Andre,
You picked a good product; No ich has been used by me on two separate occasions. The first time I used it was on my 12 gallon cube.
I had gotten a really bad ich outbreak and I did nothing to cure it as I believed there was no medicines that could go into a reef tank with inverts.
I was totally wrong and paid the price as I watched my fish die one by one; back in my early days in reefing it was just copper with quarentine.
Today there are meds like no ich that can help a lot but do not kill the ich let me explain.
I read and read articles that copper and low salinity in quarentine can and will destroy a strain of ich on a fish. But the problem is as you place him back into the reef they are waiting for him there; via the sandbed and rocks.
All no ich will do is lower the strain of the attacking ich; by mixing it in the water it helps control the outbreak from becoming an epidemic.
My experiance is that it gives your fish a fighting chance to resist this attack; let me tell you what I did.
I raised my temp in my tank to 83-84 degrees to allow the bug to walk its course quicker and allow the free floating No ich to do it job. Then I continued feeding the hell out of my fish; the idea is to feed them a lot the foods that have garlic.
I used Formula two flake with Mpax and 2% garlic and also Non-medicated anti-parasitic 1 mm sinking pellets Spectrm Thera +A by New life.
They kept on eating and eating, I also had to shut off my skimmer during the week that I ran the no ich.
I treated with the entire bottle and I had half a bottle of it before so I used it up as well the idea is to run this stuff long enough to really take it's toll on the ich.
It's much like a medication one takes, you need to take it all even though symptoms look better, don't be fooled finish it all.
My blue tang had the ich really bad and I thought he would die but he pulled through, he got the ich symptoms several times during the outbreak, each time it was less and less as the ich was dying.
As your fish pull through, there immune system will get stronger and have a better time the next time around as the ich tends to come back but in less raids.
My tank has been ich free since my last documented attack on this thread.
There were zero negative symptoms towards any of my reef inhabitants; when you fire up your skimmer be careful as it will skim like mad and you will need to change the cup out several times.
Do it during the weekend when you have time....
Your blue tang should pull through if he is feeding, don't stop feeding him.... Fatten him up, give him the nutrients his body needs to fight this ich... and make sure you run the No ich all the way through....
Mike G