Discus can grow up to 8 inches in length and live an average of 10 years in home aquariums, but they can live up to 15 years. They will consume nearly anything that fits in their mouths, just like many fish in a home aquarium. Owing to their size, they frequently need an aquarium that is between 55 US gal (210 L) and 75 US gal (280 L).