A Dutch friend ("zozo") on the UKAPS forum has been keeping for a couple of years now, and he posted this video of some very interesting feeding behaviour.
Thr complete thread is at <https://www.ukaps.org/forum/threads/hara-jerdoni.39864/>
I asked if I could post it here and he said yes and he is keen to see any comments.
This is his post
cheers Darrel.........Mine go nuts on the crustaceans and rotifiers i feed daily scooped from an outdoor bucket filled with water, moss and leaf litter. Any time they are all over the place........Since i'm keeping these fish for 2 years now and never seen this behaivor before, till i started feeding daily with small life micro food from a few fishless tubs and buckets i have in the garden. And since then they are extremely active all over the place and what the video shows i see every day.