why is my yellow tang turning head up and flutering?

Question

it swims and the flips head up and fluters and the swim straight and then does it again. ive this tang about 4 months it just started it my other tang does not do this .

Answer 1

Check to see if anything is in it's mouth. It is probably having fun with something it caught. Their behaviour is often amusing.
This site will calm any of your worries about it's health http://www.marineaquariumadvice.com/Yellow-tang-zebrasoma-flavescens.html .
A

Answer 2

maybe it's spazed