Neurotic Tang

I picked up a White Tail Bristletooth Tang last week. He seems healthy and is coloring up but his behavior has me concerned. His routine is to spend about 80-90% of the daylight hours swimming near the glass on one side of my tank. He swims with his mouth near the glass and moves up and down several times. Then he'll move over to the powerhead and swim circles around it several times. Always with his mouth generally pointing toward the glass. Then he might break away for a lap around the tank where he'll pick at the rocks a bit. Then he's back to the glass. He is eating a bit but he won't touch the nori I put in a clip. He also doesn't break away from his routine when I feed the tank but I've seen him pick from the bottom when he does one of his break away laps.

My Achilles tang didnt hardly eat the first 3 daysand showed the same behavior but now he eats everything (brine,mysis, bloodworms, nori , and flakes!) and ive only had him 2 weeks!

Thanks everyone. He already seems to be doing better. I fed the tank last night and he proceeded to pig out. I guess that's a good sign. 

Yeah, I thought of that too. Did some tests and my Alk, Ca, & Mg were getting kind of low. Also, my salinity was getting a bit higher than I like (1.026). I did a water change (5 gallons with only 1/2 cup of salt) and doubled my doses of Alk, Ca, and Mg. I've added quite a few corals recently but I didn't up my dosing so I'll need to adjust for that. Hopefully that will make him a bit happier.

Thanks! I got mine from Reef On in Midvale. I was placing an order for one and they just happened to get one in that day in a large order of various tangs. He hasn't fully colored up yet but I plan to post a pic when he does.