I think that this is an eel. Snakes do not breath underwater. I missed this too. It was hardly moving and appeared to be a branch. Certainly it is colorless and featureless. It is hardly moving. It was more or less just drifting along. This was another first on the reef for me.
I know that this does not look like much. But really, the fun here is to see something entirely different. I’m a veteran diver. Sort of….and there is still the wonder of finding something new. And this qualifies as fascinating and new. So… pardon my enthusiasm!