Ich and tang...

I made a stupid mistake and I added some new live rock
to an old, established tank without quarantine it first...
The effect: my large hepatus tang got ich.

I do not want to cure it in the reef and taking it out
will be a challenge. I was thinking about getting some
cleaner shrimps to eat the parasite from the fish skin.

I plan to buy two skunk cleaners (Lysmata amboinensis)
but in the mean time - how about adding some peppermint
shrimps? I have 3 medium sized Lysmata wurdermanni in
an other tank, I could move them to the tank with tang.
Do you think it is a good idea?

BTW
- I have two large maroon clowns and adult royal gramma
in the same tank with the hepatus tang... They do not show
any symptomps of ich. Can they be host without symptoms?