German blue rams can grow to full size within 4–6 months.
Like many other cichlids, German blue rams reach maturity fairly quickly, within the first four to six months of their lives. By then, they grow to be around two to three inches long. At that age, they’re also ready to spawn with their mate.
Furthermore, if provided with proper care and high-quality food, healthy German blue rams can live to be three to four years old. Unfortunately, poor breeding practices, bad genetics, and improper care can shorten their lifespan.