Balloon Molly

Poecilia sphenops

Animalia›Chordata›Actinopterygii

Variety of Molly · balloon

📍 Central America

A selectively bred variety of the common molly with a distinctively round, arched body caused by a spinal curvature mutation. Due to its compressed body shape, it is a weaker swimmer and more susceptible to swim bladder issues than standard mollies, so gentle flow and a stress-free environment are especially important.

Size2.5"

Min Tank20g

School3+

peaceful

Zonemid

Care Guide

Diet

Balloon Mollies are omnivores that thrive on high-quality flake foods and small pellets as a staple, supplemented 2-3 times weekly with frozen foods like brine shrimp, daphnia, or bloodworms. Include vegetable matter such as blanched spinach or algae wafers to support digestive health. Feed small amounts once daily, only what they can consume in 2-3 minutes.

Behavior

Balloon Mollies are peaceful, slow-moving fish that prefer mid-water zones and spend much of their time grazing or resting due to their compromised body structure. They are social and do best in small groups of 3 or more, though males can be territorial. Their reduced swimming ability makes them vulnerable to aggressive tank mates and strong water currents.

Breeding

Balloon Mollies are livebearers that breed readily in captivity, with females producing 10-40 fry every 4-6 weeks under stable conditions. Breeding is not difficult, but fry survival is low in community tanks without dense vegetation or a separate breeding setup. Provide plenty of plants like Java Moss or Water Sprite for fry to hide and feed on infusoria.

Tank Mates

Guppy

Similar size, peaceful temperament, and identical water parameter requirements make them ideal companions

excellent

Platy

Fellow livebearer with matching care needs and peaceful behavior; can interbreed but fry are typically sterile

excellent

Neon Tetra

Small, peaceful schooling fish that occupy upper water column and won't harass slow-moving Balloon Mollies

good

Ramshorn Snail

Peaceful algae eaters that help control bioload without competing for food or space

excellent

Dwarf Gourami

Generally peaceful but can occasionally nip at slow fish; monitor behavior closely

caution

Common Diseases

Swim Bladder Disorder

Symptoms

Difficulty maintaining buoyancy, floating at surface or sinking, tilted swimming posture

Treatment

Reduce water flow, increase water temperature to 78-80°F, feed high-quality foods with minimal fillers, perform frequent water changes; may be permanent due to genetic spinal curvature

Fin Rot

Symptoms

Frayed or deteriorating fins, discoloration at fin edges, lethargy

Treatment

Improve water quality with 25% water changes every 2-3 days, reduce tank stocking, treat with aquarium salt (1 tsp per gallon) or antibacterial medication if severe

Ich (White Spot Disease)

Symptoms

White spots on body and fins, excessive scratching against objects, rapid breathing

Treatment

Raise temperature gradually to 82°F, treat with aquarium salt or commercial ich medication; maintain treatment for 7-10 days and monitor for relapse

Constipation

Symptoms

Bloated appearance, reduced appetite, lethargy, stringy feces

Treatment

Feed blanched vegetables like spinach or zucchini, reduce pellet feeding, perform water changes; avoid overfeeding which is common with these slow-moving fish