Problem with water?

[Rustybread]

I have a yearling who went into his water dish before I left for work & when I got back a few hours later he was still in there. I took him out, & placed him under his lamp to heat up & he crawled into his house. But in his water, there was an odd liquid/solid substance in his water (which wasn't there before I left for work). It almost looks like very clear snot, or the goo that encases frog eggs. It's about the size of a marble. Does anyone know what it could be? & should I worry about it?

 

[wellington]

Not sure what you seen. However, are you sure your tortoise can get out of the water dish easily and on his own?

 

[Rustybread]

I'm positive he can get out. I took a few photos to show you. this is him next to his bowl, to show you that he can access & get out of his water bowl easily.
this is the glob that I found in his water. (The stuff around it is just a little bedding that got into his water)