Black Bullhead Catfish Baby Food?
 

I recently acquired a baby black bullhead. He's about 2 1/2 inches. What can I feed him?
And will he try to eat my betta fish and live plants?
I think he did eat the betta pellets that fell to the bottom of the tank, can I feed him those?

If he's in a tank with a betta you are going to need to upgrade pretty fast; the commonly get about a foot long. Ictaluridae (most NA catfishes) are notorious for eating anything that fits into their mouths. Most people see them as angling fish, not aquarium fish. I would be very careful with him and your betta. In the meantime you can feed him sinking pellets.

I once found a website with a lot of good information about keeping ictalurids. I'll see if I can find it again.