moody GTBA

I have a realitivly new GTBA I have had it for a week and a half now.  When I put it in the little spot I was hoping it would be in at first he was super stressed open mouth etc.  Then it seemed to settle right in nice and open by the next day it had moved to the underside of some rocks where there was no real light.  He stayed pretty much closed under there hanging out for a few days.  I took the rock he was holding onto and turned it over so he would be getting some light but again he moved to a very shady location.  I did notice a pep shrimp picking at it quite a bit so I have removed that shrimp.  He moved around to the back side of the tank where I can not really see him or get pictures of him, but if I can't see him from the top that means he is not getting much light.  It seems a little pointless to me to have a GBTA that you can't see in the tank but being that I am new to the hobby I thought I would ask what the best approach going forward would be.  Just let him be and go where he wants to go?  Or try to get him to a area where there is more light and where I can get to him to spot feed him??