So I just noticed 1 of my neons swimming with his head pointed towards the ground and it looks like he is bobbing backwards and forth as he swims with his head down and tail up. All my other fish are fine. I dont think its ntd as he was fine 30 mins ago and I cant see any buldging eyes or lesions/white spots and his color looks magnificent. He is still schooling but his swim pattern is different to his mates. He looks a little fat. Could it be swim bladder?