Yellow Tang Acting Weird

My yellow tang has adopted this odd new behavior. He just goes in this shallow cave and like basically shakes. He does it for maybe 5 minutes at a time and comes back roughly every 10 minutes. I've had him for several months and this has started within the past few days.

Has me a little worried.

Sorry for the bad cell phone video but its all i had available today.

Any ideas?

- Thanks, Ford

 

Have you added any new fish?

What are your parameters?

 

i actually added a purple dottyback about a week ago, but they seem to get along just fine.

my params:

cal: 450
alk: 8.2 dkh
mag: 1350
ph: 8.0
sg: 1.025
temp: 82
nitrates: 0

thanks

 

Update: as of this morning he is just swimming head on into my mp10 non stop, did not seem interested in nori either.

 

is he in the 75gal?
2 things - bring down the temp to 79/80 might be an oxygen level issue
could be the new add or do you have a fish coming into maturity that is trying to move the yt out of its territory?

 

Yeah he is in the 75, I will try to get the temp down but it always seems to sit at 82, maybe I will throw in an airstone in the sump for good measure too. The only thing I can think of is that the new dotty back stressed him? But they seem fine.

His color is perfect but he looks thin as of after class this morning, still not eating nori.

 

Just curious, how big is he?

 

About 2.5 inches or so.

 

This is what i am now currently dealing with, he wont leave the mp10. coloration is still normal, just getting skinnier and wont eat.

again sorry for the poor video quality

- ford

 

Is he rubbing against rocks or breathing wierd at all?