Palmas polli is a good choice, they are one of the most active bichirs, they love to swims around. Palmas palmas and delhezi are good too, they like to swim, beuttikoferi is the shy one loves to hide.
Try to feed 50% hikari sinking carnivore and 50% tilapia, like mikee870 mentioned you'll get alot of nutrients in the pellet and alot of protien in the tilapia. As they grow bigger you can do 70% tilapia and 30% hikari its really up to you. I do 70% tilapia and 30% hikari cause the pellets i use is a hikari massivore that cause $30 a bag. So i only use the pellet twice a week. Shrimp i only use once a month just for treat.
Try to feed 50% hikari sinking carnivore and 50% tilapia, like mikee870 mentioned you'll get alot of nutrients in the pellet and alot of protien in the tilapia. As they grow bigger you can do 70% tilapia and 30% hikari its really up to you. I do 70% tilapia and 30% hikari cause the pellets i use is a hikari massivore that cause $30 a bag. So i only use the pellet twice a week. Shrimp i only use once a month just for treat.