Freakin Yellow Tang bites everytime I put my hands in the tank!

[GreenSpottedPuffer]

I can't figure out if he doesn't like me in the tank or he thinks I am food. He seems to bite at the hairs on my arms but also my finger tips, so I don't know. Is this common?

He also lets me hold him by the tail and also pet him, so I don't know if its that he doesn't like me...

My Naso tang also lets me pet him and cup him in my hands which I find weird.

Are tangs usually this friendly? All the ones I have owned in the past are not.