i dont know if this has been posted yet, but as of 5.4 there is a quite cool glitch going on.
you can now use the cloud serpent mounts underwatner without cloud serpent flying
https://i.imgur.com/QPQFfDl.png
https://i.imgur.com/UswWwq3.png
as long as you're underwater and the breath bar comes up you can mount it with/without the cloud serpent riding skill.