I was a Petco recently and heard an employee saying Betas don't get along with others and a small container is fine. I went back today for a animal purchase and tried to enlighten the cashier. Oh hell no she was with the other person. They were leading these people to believe small containers were fine. I'm going back tomorrow with a print out to speak to the manager about their employees education on this matter. Mines in a 14 gallon Biocube with 6 Cardinal Tetras and 3 Julian Cory Cats.