Comment by GolfPopper

>this weird rainbow snake floating around.

Sounds like it might have been a 'floater':

https://en.wikipedia.org/wiki/Floater

(I've had one myself for my whole life, a 'crystal worm'. I usually don't notice it, fortunately, but once it a while it will noticeably drift into my field of view while looking at a bright, blank field - like the blue sky or a monochrome computer screen.)