HELP!! Copperband Butterfly Just started floating like it was dying!!

[wetjet43]

56gal aquarium
40lbs live rock
no coral - Just a few zoanthids
Ammonia: 0ppm
Nitrites: 0ppm
Nitrates: 10 - 15 ppm
PH: 8.4

It has been hiding in a cave today, and all of a sudden, it's floating around like it's not trying to swim!

I just did a 20 gal water change. hoping to fix whatever was causing this... but nitrates at this range wouldnt be a factor, would it?

It did have some strange spots on it the other week, but they went away.

The only thing I've done today was move the output of my canister filter above the water line to make more surface movement.

I also added new lighting 3 days ago.

Also, it's scales are discollored, almost white in spots.

It doesn't seem to be breathing heavily, but it is trying to stick its nose out of the water. The O2 levels in my tank are fine. All of the other fish seem fine.

See the pictures:

<a href="http://s271.photobucket.com/albums/jj151/wetjet43/?action=view&current=sickbutterfly2.jpg" target="_blank"><img src="http://i271.photobucket.com/albums/jj151/wetjet43/sickbutterfly2.jpg" border="0" alt="Photobucket"></a>

<a href="http://s271.photobucket.com/albums/jj151/wetjet43/?action=view&current=sickbutterfly1.jpg" target="_blank"><img src="http://i271.photobucket.com/albums/jj151/wetjet43/sickbutterfly1.jpg" border="0" alt="Photobucket"></a>

 

[wetjet43]

Also, it's left pectoral fin is pink where it attaches to its body on the inside, and it's not moving the fin at all.

 

[wetjet43]

Never mind, it died.

 

[Recty]

Sorry to hear. Normally if they start floating around like that, they arent long for this world.

 

[paulamrein]

CBB are notoriously difficult fish, they say as long as you get one that is eating it can live up to 10 years +. But, I have never had one more than a month or so live, even had one literally eating out of my hand than one day died. They aren't impossible, and even easier than Moorish Idols, but they are difficult.

 

[Albanets202]

he looked very skinny. How are your other fish?

 

[dones20]

agreed he looks malnutritioned imo

 

[JHemdal]

Too late to try it in this case, but a collegue of mine came up with a great idea when you experience fish loss like this (skinny with discolored scales) - give the fish a freshwater dip AFTER it has died, and scan the settled out water with a hand lens for flukes. The importance of this of course is so that you can either confirm or rule out this disease in time to help the remaining fish. This only works on a fish that has been dead for less than a couple of hours.

Jay