UPDATED: Lou is actually looking normal now! He/she/it got rid of the buoyancy problem and is discovering the bottom of the fish tank.
I've posted about this fish before, but Lou's resilience and battler attitude has impressed me. It's a sign that even though something bad in your life may have happened (in this case, the swim bladder is all screwed up), then you can still keep charging along.
Or maybe the fish is just thinking "when the hell are they going to let me f#%ken die?"