I need guidance with my BTA. I got it about 7 months ago and it was 3" across. It's foot was very dark red/brownish. He ate very well and was doing good. Long beautiful tenticals. I changed my T5's out one set a week (three sets of two). It moved from the top of the tank down to the middle into the shade and stayed there for two weeks. Then he was floating on the bottom. I scooped him up with a bowl and gently laid him in between two rocks toward the top until he took hold. He is still in that spot, but he will not eat and he is shrinking. His color is good, but he has been shrinking since he moved down to the middle of the tank. He stays mostly closed, but when he opens, he is only 1 1/2" across. From what I know, it sounds like he is dying. Is there any reason he could be acting like this? Does anyone have any ideas that I could try?