Ick is probably in your main tank and your other fish are carrier but they only have the parasite on their gills. Then you introduce the new fish and it catch ick from your fish and get sick.
I don't think it had ick to begin with as it would probably have show some of it just from the stress of being in a new place in quarantine. It make sense that if you had ick in your main tank the naso would get contaminated shortly after introduction.
The reason why ick pop up here and there in some tank and seem to be disapearing for some time is because it can stay at a low level of infection on the fish gill and you will never see any sign of it but make no mistake, it is there anyway.
I quarantined a blue hippo with ick and a yellow tang before in a 20 gallons tank for 6 weeks and not only did they survived but the yellow tang was bone and skin when I got it and after the quarantine it was as fat as they get. I did the quarantine with hyposalinity and that killed the ick for good. I don't think quarantine done right with good water quality can kill a fish. I did the same for my copperband butterfly which was also skin and bone and in 3 weeks in quarantine he was fat and happy and free of flukes and breathing normally. Quarantine is a great period to observe a fish and treat it for any parasite or disease. I treated my copperband with Prazipro for fluke and internal parasites...It was full of both, now 7 months later it's healthy and happy.
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Originally Posted by MarkoD
bought a blonde naso tang about a month and half ago from a store that said the fish was eating.
brought it home, it wasnt eating, i tried every known food for this fish and all it would eat was nori.
i had it in quarantine for 3 weeks and moved it into my display.
its been in my quarantine for about a month now and couple days ago it got ich. (but it was still eating)
i get home today, the fish is stuck to a powerhead but still alive.
i quickly get my quarantine going and put him in there. he's floating around but doesnt have much energy to swim.
seriously what made this fish sick 7 weeks after buying it? none of my other fish are sick or showing any signs of ich. they all eat like crazy.
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