Nope does not lean, looks totally normal, he just swims in the one spot, kind of like when they are sleeping, just stays in the one spot. A few times when he is down there I have seen him open and close his mouth, sort of like rapid breathing, but not sure. It almost looks like he is stuck in the current of the filter intake, and just when I think he is stuck and that he can't swim out of the current he does. He never gets too close enough to the filter intake, probably a couple of inches away from it, he has never gotten stuck to the filter intake, and he is always able to swim back up at rejoin the group. I actually have not seen him do it at all today, so maybe he just needed a little more time to get used to the surroundings. I am still watching him but so far today nothing unusual, I have not seen him looking pale (well in the morning they all kind of look pale but it goes away once the light has been on for a few minutes), not even the odd behaviour.