dude what the heck!

[hrairguitar]

I have a 75 gallon tank that I've had for a year and haven't added any new fish for at least 6 months up until the past 6 weeks I've added 1 every 2 weeks. Original residents were a maroon clown, 3 damsels and a watchman goby. I had thought the tank had ick about 8 months ago and that was my reason for not adding anything new. The 5 fish I had showed no ick symptoms whatsoever over this time. Fast forward 6-7 months and girlfriend gets on me for lack of fish so I added a medium sized yellow tang. I wait 2 weeks and no issues. I then add a medium sized flame angel and wait another 2 weeks and no issues. I'm amazed and relieved no ick signs and all fish are going strong. I figure I have room for 1 more fish and get a small blue tang a little bigger than a quarter. WITHIN 2 days this thing is scratching and covered in ich. And on top of that I caught my yellow tang scratching a little bit although no signs of ick.

I guess my question is did my water most likely have ick or did my blue tang come with ick and share the love to the yellow? I've had experience with ick and a blue tang in the past. I quarantined/hypo'd all fish in that tank. Most fish survived and are in a different tank but in the end the blue tang unfortunately did not :-(

And I know what ur thinking "why didn't you quarantine the new fish first if you've had ick issues in the past". My answer is my 20 gallon QT tank is housing fish for my 300 gallon tank that's being set up this month and didn't want to add anything to it til they go in the 300

 

[CT Reefer]

Not sure what your reason for thinking you had ICH in your tank some months ago, but I can tell you from personal experience, once you have a fish infected with ICH, ICH is in your tank and will remain so as long as you have fish in it (regardless of visible signs of ICH or not). The only sure fire way to get rid of it, is to remove all fish and treat them in a hospital tank (using one of the methods described in this forum). You should leave the display tank fishless for 10 weeks. Only thoroughly QT'd fish should find their way back into your tank. Sorry for your trouble

 

[MrTuskfish]

I imagine the blue tang brought the ich along. Your last paragraph is your answer

And I know what ur thinking "why didn't you quarantine the new fish first if you've had ick issues in the past". My answer is my 20 gallon QT tank is housing fish for my 300 gallon tank that's being set up this month and didn't want to add anything to it til they go in the 300

Obviously, you know the value of a QT. But you added I fish without being quarantined. Of course you have ich now.