best to feed aros floating pellets, just make sure to remove uneaten foods as they can upset your water quality, with the bichir maybe hes not hungry? fish can last awhile with out eating, to get picky fish onto pellets they can be starved until they learn to eat the pellets. Other then the bichir not eating i cant help sorry, ive never had the pleasure of owning one yet, they are quite expensive is Australia.....I just fed him frozen bloodworms. He will not go for the ones that sink but he ate everything that stay at the top floating. I’m having trouble with me ornate he can’t seem to find the food that sunk to the bottom of the tank. He actually swam by some at the top but didn’t eat it.