Lately I've noticed a few bubbles on the surface of the water, but they were few in numbers and generally popped in a few minutes, but this morning I woke up and found a bunch of bubbles on the surface of the water in my tank. They aren't the normal kind, they are kind of thick and unpoppable (if you know what I mean), they are a little sticky, and the surface of the water seems a little thick too, like a little film. After observing the turtles for a few minutes, it seems that when the turtles surface for a few seconds, then dive back into the water, they release these bubbles, except these bubbles are thick, anything up? Possible RI? I also saw one bask, and one or two trickled out of its mouth when it did.
The surface view of some of these bubbles.
View from under the surface of the water.

Hey hey hey.