I have a BTA that I got about 3wks ago everything was fine until I did a water change last Sunday it deflated I read that this does happen sometimes when you do changes about three hrs later it was fine past couple days its been getting real big and then shrinking. Just now I went to look at it and it is total inside its self . not sure what is wrong with it the only thing I did was turn the intensity down on light cause he is hanging in the bottom of tank could this be the reason?