When I 1st started in the hobby and didn't know much of anything I lost almost all the fish I had due to an ich outbreak. However it was due more to my poor unknowledgeable QT skills then it was the ich that killed them. My corals and inverts were fine.
The 2nd one was when my boyfriend added a fish to my tank without my knowledge from a questionable fish store and a marine velvet outbreak occurred. All my corals and inverts were fine however I had to deal with 8 weeks of QT, copper treatment, 50g water changes every other day and after all was said and done I still lost 26 fish (between two 230g tanks) and only 8 survived. That was so far the worst thing that I have experienced in this hobby and I hope I never have to go through anything like that ever again.
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One more fish should be ok?, right!!!  - Laurie
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