I've had both oscar and bichir for about 3 weeks. Just fed the bichir. He ends up getting a piece of fis, other oscar eats his other piece of fish and bichir ate a pellet after it being right in front of him for about a minute.Its normal. They are slow eaters for the most part. I have some that will play with the pellets/tilapia before eating it. They'll sniff it, role it around inder there chin swim away, come back and eat it. Others will go nuts and eat right away.
How long have you had the endli ?