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Now, for an answer to your age-old question, NO...its not possible to rid/eradicate/cure ich, in a reef tank, with any sort of in tank treatment. You will need to remove the fish and put in QT/HT for treatment, you decide which treatment works for you(i have heard ginger works great). I would suggest you look into TTM and copper treatment for you currently infected inhabitants.
Can you explain why, as would like to know more?
The ICH is still in your tank and it either A. the fish become "immune" or B., the parasite fell off and is reproducing in your substrate and will reappear within 72 days.I had whitespot about 6 weeks ago, affected vampire and regal tang,and treated with polyp lab medic.
Had a bottle on standby and reared treated from day 1 of outbreak and increased feeding from 2 to 3 times per day.
10 days later cleared up, fish looked plump and all ok.
I might have just got lucky but I do believe treating from day 1 and increasing feed helped.
I am sure QT is more effective but I have a rock wall with lots of hiding places so would need to dismantle rock or be very lucky to catch fish and I am sure this would add to their stress so I would not tfr to another tank. Not saying it is wrong just my circumstances.
Paul
. After tank got back to regular temp, it went away. Has happened three times this winter due to hard to diagnose HVAC problem. Fish have always bounced back with no ill effects. It's like the common cold I suspect, always there waiting for you fish to get weak enough to overtake them. At least that my experience over the years. I have lost very few fish to this in the past 20+ years. If you have a fish that seem to shake it catch, QT and treat. It comes to your tank through new fish, and corals. If you can QT your stuff for at least 30 days. I'm no expert but works for me.
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