I have a shoal of corydoras. The largest female passed away recently due to bacterial infection. While she was sick she would place herself underneath certain leaves up against the glass to keep her from floating at the top.
Right now my albino cory (believed to be male) has begun a peculiar quirk where he swims up to those leaves and forcibly pins himself vertically between them and the glass where she used to go. I know he has no floating issues. Has anyone heard of this? Is it possible my albino could be in mourning, or is it perhaps a sinking problem?