Just added my ink fin calvus to the tank. He immediately went to the bottom and tried to wedge himself into a tiny space. To the point where his head was buried and his entire body was sticking out. What gives? I checked PH and the LfS had a ph of around 7-8, mine is around 8-9 because I assumed that he would've been kept in hard water. I touched his tail and he didn't move. I added some neutral PH to the table and that made him a bit more lively but he still keeps doing to caves and wedging himself in awkward spots he doesn't fit in. Why is this happening.