Marble Molly

Poecilia sphenops

Animalia›Chordata›Actinopterygii

Variety of Molly · marble

📍 Central America

A molly variety featuring irregular black-and-white marbled patterning distributed unevenly across the body, with each individual having a unique pattern. Hardy and peaceful like other mollies, it is easy to breed and keep in community tanks, and benefits from hard water and regular vegetable matter in the diet.

Size3"

Min Tank20g

School3+

peaceful

Zonemid

Care Guide

Diet

Marble Mollies are omnivorous and should be fed high-quality flake or pellet foods as a staple, supplemented 2-3 times weekly with blanched vegetables like spinach, zucchini, and lettuce. Include occasional frozen foods such as brine shrimp or daphnia to provide variety and essential nutrients. Feed small amounts once daily, only what they can consume in 2-3 minutes.

Behavior

Marble Mollies are peaceful, active swimmers that spend most of their time in mid-water zones, occasionally browsing near plants and substrate. They are social fish that do best in groups of 3 or more and exhibit minimal aggression toward tankmates. Males may display mild territorial behavior during breeding, but overall they are excellent community fish suitable for planted tanks.

Breeding

Marble Mollies are prolific livebearers that breed readily in captivity with minimal intervention; females can produce 20-100 fry every 4-6 weeks once mature. Breeding is encouraged by warm water (78-82°F), abundant vegetation for fry to hide in, and a diet rich in vegetable matter and protein. Fry are relatively large and hardy, though many will be consumed by adults unless separated into a nursery tank.

Tank Mates

Guppy

Similar peaceful temperament and water parameter requirements; both thrive in community settings

excellent

Platy

Fellow livebearers with identical care needs and compatible peaceful behavior

excellent

Neon Tetra

Small schooling fish that occupy different water zones and have compatible water parameters

good

Ramshorn Snail

Peaceful invertebrate that helps control algae without competing for food or space

good

Anubias Nana

Hardy plant that provides shelter and won't be uprooted by mollies' activity

excellent

Common Diseases

Fin Rot

Symptoms

Frayed, discolored, or deteriorating fins; lethargy and loss of appetite

Treatment

Perform 25% water changes every 2-3 days, improve water quality, and treat with antibacterial medication if severe; ensure adequate filtration and avoid overcrowding

Ich (White Spot Disease)

Symptoms

White spots on body and fins, rapid breathing, fish rubbing against objects

Treatment

Gradually raise water temperature to 82-84°F over 48 hours, treat with ich medication, and perform daily water changes; maintain treatment for 7-10 days

Velvet Disease

Symptoms

Fine golden or rust-colored dust on body, clamped fins, rapid gill movement, lethargy

Treatment

Treat with copper-based medication or salt baths (1 teaspoon per gallon), raise temperature to 80°F, and dim lighting; perform daily water changes and treat for 7-14 days

Constipation

Symptoms

Bloated appearance, lack of feces, reduced activity, loss of appetite

Treatment

Increase vegetable intake (blanched peas, spinach), perform partial water changes, and fast the fish for 1-2 days; ensure varied diet with adequate fiber