I think tank bred are way too hardy.
Just to do "kind of" an experiment, I added a captive bred clownfish on the very day when I received my cured live rock (no fish police I hope :P). And guess what? It is still kicking and way too playful (tank's running more than a month now). Then I got a wild one few weeks after adding the first one, and suddenly it stopped eating, mouths were stuck open and I knew it would get ich very soon and I was true and had to put it out of its misery.
This caused me to be curious since my situation is either caused by the fish being wild or the fish being sick initially!
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