Balloon mollies

Balloon mollies are man-made, ornamental freshwater fish known for their short, rounded bodies caused by a selectively bred spinal deformity like scoliosis.

Overview and Appearance

Origin: They do not exist in the wild and are bred from regular mollies like the Mexican molly (Poecilia sphenops) or sailfin molly.

Shape: Their unique balloon-like shape comes from a compressed or curved spine that distends their abdomen.

Colors: They come in many bright colors and patterns, including black, orange, white, gold, and Dalmatian-spotted.

Ethics and Health: Most users on Reddit agree that breeding these fish for a deformed spine can cause internal organ crowding and chronic health issues, leading many aquarists to view the practice as unethical.

Tank Care and Requirements

Tank Size: They need an aquarium holding at least 10 to 40 gallons (or roughly 40 to 75 liters) for a small group.

Water Parameters: Keep the water warm between 72–82°F (22–28°C) with a slightly alkaline pH of 7.5 to 8.5.

Diet: They are omnivores that eat flakes, pellets, algae, and frozen foods like bloodworms.