Please help - Naso Tang

Tim Plow

New member
I have a Naso Tang that is my favorite fish (6-8 inches). He is usually always out and very active, especially when I feed. This morning I had a fairly wrasse that I have had for about 2 weeks die. I had him in qt for about 1 week then moved it up to my main display because he was looking fine. Today at lunch, I noticed my fairy wrass was upside down, and it later died.

Now, my Naso Tang is looking very bad. His color is not right and he won't come out of his hiding spot. He recently came out for a sec or two, but he was swimming kinda sideways. My other fish (2 clowns, blue tang, yellow tang, 5 chromis, hawkfish) are all doing fine.

There are a couple of things that happened. Last night it got really cold and my tank got colder than usual (usually it stays between 78 - 80 °F, but last night got to about 75). Also, my salinity got up to about 1.027 (normally keep it around 1.025).

Any ideas on what is happening. I really don't want this fish to die. My guess to what is happening is either the fairy wrasse brought in a disease, it got too cold, or my salinity was too high, but I don't understand why all my other fish are doing fine.

PLEASE HELP

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