I don't the fish looks very stressed or anything, just the angle of the picture and shadowing made it look "unusual", the lips on mouth does look a bit strange tho. that's the only thing I notice being "weird" based on the original picture posted.
the gill curl part, it's very difficult to tell from the angle, much easier to see if look from behind or below so if there's any "curled" part can be easily spotted.
if you noticed that there's a lot of waste in the substrate then you should remove them other wise it will speed up the ammonia production and cause your water to go bad faster.