I have a 3" Endi ive been growing out in a 20 gal long. He was very timid at first but now he is no longer shy. But.....he is uncontrolably floating to the top. Its been going on for about 2 or 3 days now. Still eats no problem. Im assuming its something to do with its doubble air bladder. He has to forfcly swim to the bottem and wedge himself under some drift wood to stay at the bottem.