the best thing to feed it is, pellets. however, variety is key! some other things u can feed as well include:
-prawn
-tilapia
-earth worms
-silversides or lancefish
-mysis shrimp
-brine shrimp
-krill
-bloodworms
-tubifex worms
-squid
ur endi will probably not eat pellets right away. u will have to train it to recognize it as food. a method that has been very successful for me in the past; is to marinate the pellet in the bichirs favorite food. the scent of the favorite food will attract the bichirs attention and help it recognize that it is indeed food! also, be patient this may not work the very first time. make sure not to over feed. clean up any mess u make from the food left over.
heres a list of pellets u can feed:
-shrimp pellets
-worm pellets
-cichlid pellets i.e. Hikari cichlid gold.
my all time favorite pellet to feed is Hikari Massivore! my bichirs love it! - their diet is 80% this.
u can also feed:
-spirulina sticks
-brine shrimp sticks
-Algae wafers
-regualr wafers - i recently got my ray and bichirs eating this!