Did you Quarantine and medicate the new fish before you put it back in your display tank? If not, that would be where the ich came from

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How did you treat your fish for ick? if you did not do an appropriate treatment and simply removed them and put them in QT without treatment, then put them back into the tank, surely enough the ick would be back.

If you did treat them, maybe the treatment was not enough to kill it.

Treated with copper and and no sign of ich prior to returning to DT tank. But still showed up a month or 2 after returning to DT. :sad:

Lost a kole tang this morning from ich, was not doing very in dt, move him into qt, died in qt, hoping my chevron survives this ich bout in the dt

Lost my powder brown tang this morning:(

that appears to be a very quick succession of deaths! Sorry to hear about them.. It's possible that it isn't ich though. Marine Velvet for example traditionally kills fish much much quicker than Ich can, yet can appear like ich with white spots on the fish.

Both these fish along with the Chevron were in QT, with Cupramine for a couple of weeks before I placed in DT

It's been a little while, but if I recall correctly Cupramine treatment should last 3-4 weeks. The only time that the parasites are susceptible to the copper is when they are free swimming or attached to the fish. If they are in their cyst form laying in the substrate, the medication will have no impact on them. Again, this is why it is important to treat for the full 3-4 weeks.

I too am concerned that what I thought was ICH was actually MV. 3 of the 4 fish dies within 72 hours of being moved out of the DT. I assumed it was due to the extra stress caused with catching them, but I could be wrong.

As a precaution, I am letting the DT go fallow for 8-10 weeks. Week 4 is complete on Saturday, so Im almost halfway.

The lone survivor, a Occelaris Clown is doing well. Treated with cupramine for 3 weeks. It was touch and go for the first week or so of treatment. Not swimming much, and not eating. Now copper free, and looking healthy and very hungry. Feeding a mix of flake soaked in selcon and garlic and frozen mysis. Good color, and back to acting like a clown.

I plan to perform a couple tank transfers over the next 4 weeks with the clown to ensure no MV/ICH gets transferring back to the DT when its ready.

Amazing. That really not typical though.

Is it me or the ick parasites are getting stronger and meaner, more resistant?