BTA on the move?

[chefer]

My BTA is on the move and can't seem to find a place to stay. He was in the same spot for 3 months and now is moving around again. I have checked all the water parameters and they are all fine and everthing else is the tank is fine. He is a good size and moves from the front of the tank to the back were he was before. I haven't changed anything in the tank so should I be concerned. He looks fine as well and the clown fish doesn't seem to mind him movin around either. Its so cool to see the clown hangin out inside the bta.

 

[K9coral]

What type of lighting do you have over the tank. Maybe he isnt getting enough.

 

[chefer]

I have 250k metal halides and 95 pc.