The Dalmation Molly is another breed that’s well suited to beginners just learning the ropes. It’s very hardy and can last quite a while in water outside the ideal temperature or pH range, mostly because water is not too hard to keep within the 68-82-degree temperature guidelines. The recommended pH of the water is 7 to 7.8. The Dalmation Molly is happiest in tanks larger than 30 gallons and can grow to reach almost five inches. They are usually peaceful and do not become aggressive unless provoked. The black and white markings on this fish closely resemble those of a Dalmation puppy, hence the name.