I am already missing those warm summer mornings on Flathead Lake. Often a fishing session would be followed by a morning snorkel. Though on the cool side, the lake did get up to 71 degrees by mid-summer. I never encountered any tropical fish, but the water was clear enough to depict interesting rock formations, fascinating under-the-lake-surface reflections, and its own array of vivid colors. Here is a short sample clip of what it looks like along Cedar Island.
PS: If you view it in “full screen,” make sure that you crank the resolution all the way up to 1080p (little cog icon, lower right).