Ich help

[Axel3034]

So I had an ich outbreak in my 100 gallon, pretty sure from a new fish I baught from my LFS. I do not have a quarantine tank and was in a process of setting a 55 tank up for a quarantine when I noticed signs of ich, I treated with kordon ich attack while I was letting the 55 cycle, when bam I just lost everything in a week and a half to two weeks, I noticed the ich after it was already to late, 3 fish were covered in white spots and I mean covered, came home from work and it was like over night I threw them in a tub of salt and let them soak and threw them back into the tank. The two tangs and angle were the first three to go. all that is left standing are my pink spotted goby and and 6 line wrasse. Neither of them are showing signs of ich, at all even after two more weeks of being in the same tank that everything died in. Will they survive or should I still put them in the quarantine tank and treat with copper. And how long will it be before I can add more fish and start my tank back up? And also should I change my sand bed after something like this happens?

 

[Sapelo]

You do need to remove your remaining fish and treat them for ich as they now carry it even if they never show signs. Your display tank needs to be fallow for 72 days (no fish).
No reason to remove the sand bed, just leave the tank empty.
There is a great sticky on understanding and treating ich: read it.

 

[ThRoewer]

Those survivors likely have acquired immunity against ich at some point in the past. They could be perfectly clean and fully immune or only be partially immune and have an occult and asymptomatic infection (usually in the gills).

If you want to be on the save side you should put them through a round of TTM and then hold them in the 55 gallon tank. You may need to let the DT without fish for at least 11 weeks to be save.