Hi! I'm sorry you haven't gotten any replies - are your water parameters, such as ammonia and nitrate, ok? Is the water oxygenated? Is the temperature within range for him?
He does look a bit curvy but I can't tell for sure. What are you feeding him?
My boys even "hang" upside down in their plants sometimes, but since they're otherwise content, making bubble nests, I'm not concerned with that.