Regal Tang ??

[George]

yes, your DT has marine ich (MI).
I will either re-home the tang (after a successful treatment) or treat all fish in a QT and keep the DT fish-less for 8+ weeks. I prefer the second solution.
There are some study showing that certain strain of MI will loose its effectiveness against fish after 11 generations. But there are more than one strain of MI in the wild and you never know what you have. And you are not sure if all your fish can survive MI throughout this period.
Good luck.

Originally Posted by Madmak

I have a beautiful 4" Regal Tang that developes ich every time he is in my DT. I have had him out for Cupramine treatment 4 times now and everything clears quickly, flashing stops, and he relaxes, 2-3 weeks each time at a proper dose.

No other fish show any signs of ich or flashing at all although the parasite must be in the DT.

I run a 30W, 36"UV with a huge dwell time 24/7 to help with this.

My question is do I try him in the DT again or is this fish better off re-homed?

I don't want to repeatedly QT him but have heard that maybe letting the ich run through a life cycle of two with him in the DT may be the end of it. Let's his slime coat return to normal and increase him immunity levels as well as increase his comfort level.

Looking for any experiences or suggestions as I'm starting to feel for this guy.

[Nano]

+1 sounds like the DT has it too, a bit strange that he is the only one getting it though

[gregzz4]

That's a really tough call as to keeping him or not

Just as you may get the flu when I won't, some fish have immunities to certain strains, and some don't. But apparently all lose this immunity over time

I'd think, from what I've read, that some of your other fish are most likely infected but it's not so easy to spot ie; in the gills

Personally, I'd run the tank fallow for 9 weeks and QT everybody with the hyposalinity method. First for the recommended period, then another 4 weeks of observation

Do it once to get rid of all the MI, then you'll never have to deal with it again
QT all new dudes for 6 weeks observation and dip everything new that you can do so safely with