Lethargic Yellow Tang...dying?

[AndrewD]

I have a yellow tang who is looking awfully lethargic. I just found him resting sideways on the bottom, was going to grab him with a net and then he slowly, very slowly turned upright and swam away. He looks perfectly fine, the other 3 fish in the tank are doing great (blue damsel, percula clown and fiji puffer). However, since I got the yellow tang, I have barely seen him eat the frozen food I have dropped in the tank. Also, he won't seem to eat the seaweed either, that I give to them about every other day. At first when introduced into the tank, he nibbbled on some of the plant life on my live rock. What should I do? I think he is dying. Thanks for your help in advance. (55 gallon tank by the way)

 

[quarryshark]

Need more info.
Any spots or marks? How long has he been in the tank and how did you acclimate?
Is anyone picking on him? What are you water parameter (need numbers)? How long has the system been set up?
The more info the better.

 

[AndrewD]

No physical marks whatsoever. No other fish is picking on him. He's been in the tank about a week and the system has been up for two months. Numbers are dead on. Thanks for the response quarry.

 

[srgetz]

What is dead-on? Please try to answer all the questions from the sticky (with exact numbers) and we can better help you -
"For saltwater fish, the following are relevant questions that will help us, to help you with any problems you may be having. Please provide as much of this info as you can in your post.

1. How long have you had the fish? Do you know if it was wild caught, or tank raised?
2. How long has the fish been in the tank? What are the tank mates? Any aggression?
3. Is the fish eating? If so what does it eat?
4. What are the water parameters? pH, ammonia, nitrite, nitrate, SPG? (actual numbers please: posting high, average or normal is not helpful) What saltwater test kit are you using?
5. Is the fish showing any physical signs of disease, grain of salt size spots, discoloration, ragged fins, misting or spots on the fins, cuts, cloudy eyes, etc?
6. Is the fish "flashing" (scratching or rubbing on rocks, decorations or substrate)?
7. How is the fish acting? Is it swimming around, or just hovering in one spot or corner of the tank?
8. Did you use quarantine? If so for how long and did you have a need to treat for any ailments? Is it in qt now? Are you currently treating with any medication(s)?
9. What size system? What type of filtration do you use? Do you have any live rock or sand?
10. Do you use any additives? Have you used any sort of meds in the main tank?"