Shrimpy Brains;534041 wrote: I agree with Assault. QT everything and you won't get ich in your DT!
I don't believe ich can be beat with vitamins. Yes, it will build the fish immune system and help it to fight off ich.
However, ich will still be in your system and feeding on your fish, just maybe not in numbers that are noticeable.
Ich is not a disease, it is a parasite.

A living thing, that must be killed to get rid of.
If you truly want to rid ich from your system, you must pull all fish out for a period of 6 weeks. I know the cylcle is considered to be 4 weeks, but there are factors which can speed up/slow down this process. I recommend 6 or more weeks to be sure. During this time the ich will go thru 4 stages of life. At the stage where it would feed on your fish, there won't be any fish to feed on, and it will starve and die.
That takes care of the DT. During this time, you need to treat your fish(which are in QT) with either hyposalinity(maintained daily and accurately at 1.009) OR with copper. Do not do both.
Side note: The benefits from garlic(other than to stimulate appetite) are only present when garlic is freshly crushed. If you want to use garlic for it's anti-biotic value, get garlic cloves and crush them. Soak your fish food in this, no more than a minute, and feed immediately.
This is just my opinion and my experience.