Naso about to die (pics)

[BigJim]

I have had this Naso Tang for about 3 months now. I had him in QT for 3 weeks before it went in the DT. I treat the QT with prazipro initially to knock out any flukes (I had this issue in the past). This entire time it's been fine and eating. Last week some weird things were showing up on it. Small white specks (not ich), spots of irritation. They would go away in a few days. Yesterday I noticed a 5mm spot where the scales were white and looked raised of the skin, the Naso still ate and seemed fine. Today he is on his last leg. I reached in the tank and took these pics. I give it a FW dip then put him in QT, nothing came off in the dip. It will probably die by the morning but I wanted to get an idea of what happened so that it can be avoided next time. Any ideas? What is a good form of treatment in QT if the fish shows no sign of parasites/infections? I don't want to treat haphazardly while the fish is already stressed.

<a href="http://s73.photobucket.com/albums/i220/divide45/?action=view&current=naso2.jpg" target="_blank"><img src="http://i73.photobucket.com/albums/i220/divide45/naso2.jpg" border="0" alt="Photobucket"></a>

<a href="http://s73.photobucket.com/albums/i220/divide45/?action=view&current=naso1.jpg" target="_blank"><img src="http://i73.photobucket.com/albums/i220/divide45/naso1.jpg" border="0" alt="Photobucket"></a>

 

[shawna1972]

Looks like a secondary infection? Maybe try antibiotics as a last resort.

 

[shawna1972]

Really sad wish I could help more,Hope more people will chime in to give advice!

 

[Recty]

The whole back couple inches of him look bloody and bruised... did you notice any fallen rocks or anything in your tank? It looks like something landed on him or hit him hard.

 

[BigJim]

Nothing has fallen over. The Naso died about an hour ago.

I had a different Naso before this one that died from flukes. Once I noticed the flukes I treated the tank with Prazipro. It ended up dead a few days later once the flukes had fallen off. I guess it was overinvested and left holes in the gills. It looked similar to this one with the discoloration except is was not just in one section. It was blotchy over the entire tang.

Don't know what happened here???

Should I be concerned with the other fish or does this seem isolated to the Naso?

 

[Recty]

Since you dont know what happened for sure, I'd be concerned about the other fish although there isnt a lot you can do. I'd watch them for sure.