Bahianus Tang problem

[crav]

I have a Bahianus Tang in my reef aquarium. It's a juvenile, 8cm aprox.
It had no problems, eating flakes, granulates, and nori sheets. Swimming a lot and looking healthy. It's been in my tank for more than a month.

Today I got to the tank to feed them, and the bahianus was behind a rock, facing up, trying to shake a hermit crab off his tail. He was looking dark, and breathing very fast. There's no visible signs of disease (no white spots, etc).

I think the hermit crabs and arrow crab were attacking it because it was still, in the gravel behind the rocks. So i put him in an acrylic breeder for now, since I have no hospital tank available. That way he can calm down and rest without being attacked.
(i'm making changes to some of my aquariums, so soon I'll have a QT and hospital tank for the saltwater display).

What could cause such a drastic change in health in the space of 12 hours? Is there anything I can do to facilitate a recovery?

All parameters are ok (PH 8.3, 0 ammonia, 0 nitrite, 10ppm nitrate, stable (~1.024) salinity.

 

[crav]

Also, forgot to say, yesterday he looked completely normal, now he looks very slim.

 

[scooter31707]

Sounds like he is almost died and the hermit was eating the died tissue off him. Sounds like it could possible be brook when you mention the slim issue. I would start by giving him a formalin bath/dip or start treatment with CP.

 

[crav]

Sounds like he is almost died and the hermit was eating the died tissue off him. Sounds like it could possible be brook when you mention the slim issue. I would start by giving him a formalin bath/dip or start treatment with CP.

Unfortunately, it's gone. 4 hours after my post, it died.
Brooklynella attacks the fish that fast? In aprox 18h, the fish went from healthy to gone.

 

[crav]

Also, I have other fish in the tank (ocellaris, royal gramma, green chromis, yellow tail damsel). They are all fine, no problems at all.

 

[CrayolaViolence]

The other fish in the tank could have developed a partial immunity to any parasites present. Velvet, brook, and uronema, all can kill very fast. Most fish will show no outward symptoms of disease and only way to correctly diagnose would be examination of gill tissue under a microscope.

So sorry for your loss.

 

[crav]

New development - turns out the other fish are not fine at all. I have another thread going for that (huge die off). Lost almost all of my fish.