Feed them more and more often.
Do you have a clip with nori hanging inside your tanks so they can eat when they want too?

Mine too eats LPS, saw him on a big piece of xenia last nite.
He also picks up snail shells and drops them where ever he wants.
Picks em up and swims backward till they fall.

Ya I keep a rock with nori on it with an elastic band.
sounds like a lot of regals do the pick stuff up and swim around thing. Mine will do laps with anything that is not fixed down. He hasn't touched my clams yet. If he starts it might be grounds for dismissal.

If your tang is a regal it is a meat eater. All other tangs are algae eaters.

If you do not feed a regal often enough and, enough meaty foods, mysis, brine scrimp etcetera, they will go after zenia and other stuff they taste and find appealing.
What are you feeding your regal?

He eats mysis like a mad man. I make a concoction of mysis,squid,brine shrimp,garlic and selcon all my fish love it. I freeze it in ice cube trays and feed it in a floating ring above a power head in the morning. They also get a feeding of flake and pellets at night. I put nori on the rock every day. I'm fairly sure the fish just doesn't like me. Everytime I go near the tank he hides out, but when my girlfriend goes near it he comes out and does his courtship swim:razz: like I said I'm fairly sure he is just a yappy dick.

Well now you have the answer to the question as to why he is acting strange.
He's horny!