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The Topsail Platy, also known as the Rainbow Platy, Moonfish, or Southern Platyfish, is a fin variation of the Xiphophorus maculatus platy. This platy has a very high dorsal fin that extends halfway to the tail. Color forms vary from red, orange, and yellow. The Topsail Platy adds brilliant colors to the aquarium as well as being very easy to keep, making it a great fish for beginners and accomplished aquarists alike.

The Topsail Platy requires a tank of at least 15 gallons that is densely planted with hardy plants like Java Fern and Java Moss. It is a very peaceful fish and makes an excellent addition to the community tank. Any other peaceful fish can be housed with the Topsail Platy.

The Topsail Platy is a livebearer and is capable of reproducing at three to four months of age. The male is smaller and more brightly colored than the female, and can be distinguished by his gonopodium. The fry will most often reach maturity in a community tank.

The Topsail Platy is an omnivore that will eat commercially prepared flaked foods and algae, as well as freeze-dried bloodworms, tubifex, and brine shrimp.

Ideal tank mates include: Guppies, Platies, Mollies, Swordtails, Tetras, Rasboras, Danios, Rainbowfish, Angelfish, Gouramis, Plecos and Scavenger Catfish.