fish still wont eat

I've had my betta for about a month now, and he's been fine, but within the past few days he's been hanging out at the bottom of the tank. Two days ago I noticed that he keeps trying to bury his head in the stones at the bottom of his tank. This morning I found him like that, and when I gave him...

okay so i've had this betta for about four days now and he still wont eat or do much more than anything than lay on the bottom. he occasionally comes up for air but maybe once an hour if that http://s117.photobucket.com/albums/o41/faithskater72/?action=view&current=head.jpg there's a link to a...