Is the focus changing via your control, or is it some kind of auto-focus?
Also, in the second video, there was clearly a larger catfish, but I don't think I saw too many more of those. How big was that one, and what's the average size of the other fish, CC or bullheads? Also, I'm not sure I could tell if I saw a bullhead or not.
Excerpt from Robert Crais' "The Monkey's Raincoat:" "She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."