Bigger tank or not, you should plan on doing a small water change daily. They also shed off their slime coat and need the inside of the tank wiped down at least once a week, and they need high quality food. They are high maintenance no matter the size of the tank.
Many of the hatcheries keep their proven breeding pairs and fry in about 30 gallon tanks.
Many of the hatcheries keep their proven breeding pairs and fry in about 30 gallon tanks.