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I lost all of my fish in the display almost the same time 7 months ago. The fish would be feeding fine and then drop dead the next day. The unicorn fish just seem unaffected and has been the only fish for the last 6 month in display. I suspect marine velvet and the unicorn fish is the only one that has developed immunity against it. It has been over 6 months now and I am not sure if the disease is still in there. I have 5 fish in holding tank and I do not dare to add them and they have been in holding for 6 months now. The fish include a powder blue tang and all healthy and fat.
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