Sick Yellow Tang

[Chameleon]

Recently I have noticed my yellow tang lose weight and become very aggressive. She is pestering the other fish ans swimming around aggressively. She continues to eat well, but even with increase feedings she has failed to put more weight back on. Her dorsal fin has also shown some signs of darkening/damage in a portion. Any ideas what is going on with her. She has been in the tank for almost 2 years with no issues. I normally don't worry too much about my fish because I am of the notion that if the coral are happy then so are the fish as long as I keep them well fed.
I really want to find out how to help my poor fish.

 

[Daniel@R2R]

What are you feeding and how often? Also, any new tank mates?

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[Dana]

The downside to tang is they seem to be sucesptible to parasites. I'll be watching your thread as I just got my first yellow tang

 

[Chameleon]

What are you feeding and how often? Also, any new tank mates?

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Spectrum pellets and nori. Pellets daily and nori once a week. A coral beauty was added from a friend's tank a month or two ago but its been a novel citizen and was in the previous owners tank for a long time

 

[dankreef]

I've had a yellow for a couple years. I feed a very mixed diet about 4-5 foods mixed up with some liquid garlic. They love krill & emerald entree (seaweed mix) mixed with other meaty foods all at the same time they eat everything. I don't feed any algae strips as they tear them off and then end up finding them in my filter socks. They also eat cylopeeze and cyclops when I feed my anthias. Just make sure you kept them fed, if I were you I would just feed more see if that calms the behavior. If theres damage on the dorsil fin such as chunks missing, thats probaby a giveaway somethings attacking it.