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I’m keeping records of how things develop in my tank, as reported in my tank thread, I had a complete fish wipeout back in October last year, I had had some of these fish for 14 years in 3 different tanks, the last one for 6.5 years, I’d never quarantined anything in all of this time, I added a gold flame angel from a private tank, id observed it on several occasions and new the reefer and his tank, this said fish had been in his tank for over a year and looked completely healthy as did all his other fish... 2 weeks after putting it in my tank all fish dead to what appeared to be velvet, the only survivers a clown fish and cleaner wrasse.. now I have no reason as to why this happened as neither of us had ever seen velvet in our tanks... I had my suspicions, I debated for over a month as to buy this fish or not as I felt my tank was at its fish capacity, all fish had established sleeping holes etc and a very defined heirachy... I knew deep down I was pushing it, but the gold flake was my No1 dream fish and I trusted 100% where I was getting it from.... I still don’t know where this disease came from or why the cascade of events happened... the reason I’m posting this on here now is, this is @Paul B thread, but I feel there are things we don’t understand and we can’t explain everything... unfortunately... I’m currently in the process of restocking and I’m not quarantining again, one thing I won’t do again is overstock and push things and follow my feelings and experiences, as a few of you have said observation and knowing your tank is crucial, spotting the changes, gaining a feel, I ignored my gut feeling and my fish paid a very expensive price..
Here is my 2cents - and I think you might be right - a key question - did you see some negative interaction between the fish, etc. when you added the gold flake. Ie - the gold flake causing stress in the others.
But the other possibilities - the gold flake carried some kind of parasite to which he/she was partially immune. And to which the others were not. The other fish got sick - the numbers of (whatever it was) grew in the tank so high that it overwhelmed even the gold flakes immune system. Or something died - it changed the water chemistry - and thats what killed the rest. You're right though - who knows.