An observation about fish digestion

[untamed]

For lunch, my fish usually get some pellets (Formula 1 and 2). Recently, I ran out of F1 (red) and the fish have been getting only F2 (green) for lunch for a few weeks.

Today, I finally got out and purchased some F1 pellets. So the fish got some red F1 pellets today at about 2PM.

At around 5PM, I happen to be watching the tank when the Lookdown pooped....red.

That means that lunch passed completely through the Lookdown in about 3 hours.

Fish are clearly designed to eat constantly. Food for thought for anyone who feeds only 1x per day.