Yellow Tang excessive fin rot

[Javamahn]

I am ashamed that my poor yellow tang has pretty much lost all of his Dorsal fin and is slowly losing his anal fin. Over the period of a year I have switched frozen to LRS Herbivore frenzy every other day and Nori on a clip on the opposite days. I have dipped the nori in selcon, garlic, and kanaplex with focus but the rot continued to progress. I have added 36w Turbotwist UV to the return on a 90 gallon tank. I have tested for stray voltage, excessive nutrients and do 15% weekly water changes. The fish is not picked on by others in the tank that include, blue hippo (same size) 2 clownfish, 2 PJ cardinals, coral beauty & melanarus wrasse. I am preparing a QT tank as I upgrade to a new tank and plan on housing the fish as the new tank cycles for 2 weeks. If the fin is pretty much gone does it make sense to hold the yellow tang longer and treat with some stronger antibacterials. I have Furan2 on hand but if the stress of extending the QT on an already skittish fish is not going to help then I don't want to make it's life any worse. The current tank does currently have a dino outbreak which may require me to do a freshwater dip before QT. Please any thoughts or help is appreciated. I juts want the lil fish to have its "sails" back

 

[Humblefish]

Sounds more like HLLE: https://www.reef2reef.com/threads/hlle-head-lateral-line-erosion.259916/

Do you run carbon?

 

[Javamahn]

I did run pelletized carbon for a while in a media bag but stopped months ago when I switched to the UV. The little guy used to be friendly to the point where I could hand feed nori and almost pet it. I had to run fallow a year ago due to ich and it has never been the same. I juts hate looking at pictures of tangs with full fins and my poor little "mohawked" fish make me feel like I failed it.

I just read you post on copper causing HLLE and I did run cupramine per the instructions in the QT last year in December for 3-4 weeks then I dialed it back with water changes. it was pretty much after I put them back into the DT that the fins started eroding. Is there any hope of the fin returning? It is all but gone with a small peak at the front.

 

[Humblefish]

Is there any hope of the fin returning? It is all but gone with a small peak at the front.

Assuming the cause has been eliminated, you can try soaking his food with vitamins (e.g. Selcon, Zoecon) to see if that will help.

I've seen some pretty bad cases of HLLE reversed by simply doing that every day. I've also read anecdotal accounts of tangs with HLLE being "cured" after placed in a system with "miracle mud".

 

[GoldeneyeRet]

Flukes?

 

[Javamahn]

Flukes?

Not sure. I have always been under the assumption it was fin rot or HLLE. Guess I need to keep reading. The QT tank should be ready by the weekend where I will concentrate on nutrition with vitamin supplements and antibacterials. I have one very large nepthea that will need to be housed as well so any medicines may have to wait until I can move it out of temp QT. The fish has been eating and swimming and generally moving about regularly for 8 months now and there are no discolored spots visible. I may still do a 3-5 minute freshwater dip before QT to lyse any dinos or pests prior