Yeah, my Colombians go into feeding frenzy mode as well. So do my new glowlights. It's pretty crazy when you have 13 fish freaking out over some food. Mine don't really separate into 'older' and 'younger' groups, it's just whoever they want to chill with that day. All are fairly actiIt seems as if my younger Colombians enjoy zipping around together. The older ones like to hang together and be still. Now, when I give them a cube of freeze dried brine shrimp or sun dried gammarus they all go bezerk and fly around in a absolute frenzy! So very cool to watch that. Yes, I have a glass top on their tank! Nice tank grant. Enjoyed your videos.