You don't need a huge aquarium to keep Mollies either

The fish is a Butterfly mix molly(likely with a gold dust or short-fin, but unknown)
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The Neon Butterfly Lyretail Balloon Molly is a hybrid variation of the Sailfin Molly, Poecilia latipinna. The Balloon Molly has an arched back & rounded, large belly. These Mollies have a large lyre-shaped caudal fin and an gorgeous dorsal fin. Mollies have the ability to adapt to a variety of salt levels in the aquarium. With a gradual acclimation, these fish may be maintained in either a freshwater aquarium or a saltwater aquarium. In the freshwater aquarium, a teaspoon of aquarium or marine salt per gallon is recommended for optimum health.
Same color but a butterfly Molly, go to my profile and you see the fish
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Haven't had any spikes or problems in more than a year and a half. Problem I had a year ago last January was and internal parasite brought in on a fish I neglected to QT(stupidest thing I've ever done I think), I have not done that again since and once it was gone, I've had no problems. These fish were not born yet. The fish is a Butterfly mix molly(likely with a gold dust or short-fin, but unknown). butterfly lyretail molly fish
Photo provided by FlickrIs It A Male Or Female Molly? | My Aquarium Club
Photo provided by FlickrHow do you differ a male molly from a female molly
Photo provided by Flickr