Mollies. Mollies are small fish with peaceful natures that can grow to be 3 - 4 inches long. It’s best to keep them in a tank that holds at least 20 gallons of warm water kept at a pH of 7.0 ...

Things to Think About. The size. Think about where you’ll place your fish tank and how many fish it will hold. Some tanks are as small as one gallon, while others can contain up to 200 gallons.

Best 10-gallon fish tank: ADA Cube Garden 45P Aquarium - See at Aqua Forest Aquarium The ADA Cube Garden 45P Aquarium, which is made of ultra-clear glass, has no rim or plastic frame to mar its ...