Throughout my research, I have seen a number of different products that can be fed to Tilapia. I started out with a bit of commercial feed, as I didn't have anything on such short notice to give them. However, we enlisted the motodop driver to find some duckweed for us. Good call.
Drop a bit of duckweed into the tank, and the fish go nuts over it! Definitely a hit for them!
I have seen some aquaculturists feeding their Tilapia only duckweed, while others feed theirs commercial feed, or perhaps black soldier fly larvae. As soon as I can get a colony of BSF's going here, I will start supplementing their diet with the larvae as well.
If I get a chance, I will try to take a short video tomorrow - errr, later today, of feeding them duckweed.
Just have to purchase the pipes and fittings first, to get the tanks set up for the children.