Powder blue tang!

[evo.howard2010]

He's not swimming around very much and falling over and he's breathing really hard? What do I do?

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[xanthurum]

Need more info, but assuming it's in a quarantine tank start with a water change. What are the water parameters?

 

[zibba]

Assuming it's still alive: get an airstone going ASAP.

If it's in a QT and not an established tank, make sure ammonia levels aren't elevated. If so, immediate water change.

Give us some more details so we can help.