Fish feeding problem?

Try to spread it around. Also, distract your oscars at one side of the tank with food, then sneakily put food in the other side ;) haha my oscars are pigs so i cant imagine trying to feed anyone else. Also, the bichir and ghost knife are nocturnal, so make sure you put food in at night for them. Btw, thats a very heavy stock, I hope you have a large tank!