You keep your molly fish happy by:
- Providing around three gallons of water for each molly fish
- Keeping them in a small group of at least four fish
- Cleaning the tank regularly
- Changing 20% of the water each week
- Providing them with a calm environment
- Avoiding keeping them with aggressive tank mates
- Feeding them an omnivorous diet consisting of high-quality flakes, live foods, and vegetables
- Maintaining the water temperature around 72°F to 78°F (22.2°C to 25.5°C)
- Providing plenty of decorations, plants, and hiding spots
- Getting a strong filtration system, standard tank lighting, and a heater