I bought a juvenile saddled bichir, abt 3 inches long, I added to a tank with 3 cichlids and a rainbow shark. They don't bother the bichir. I was advised to use stress heal so it would ease the fish of its initial stress. It's been 5 days since I've had the bichir. It's just moving along the floor. Is that normal behavior? I bought the fish only after a but load of research. I know they are lazy fish, but it hasn't been very active for the past 5 days.