Beginner Care Guide of Molly Fish

Date Posted: 2023-02-02 11:00:45

Common Name: Molly

Average size: 2 - 5 inches, depend on species

PH: 7.0 - 7.5

Lifespan: 2 - 3 years

Water Hardness: 10 - 28dGH

Temperature: 21°C - 28°C

Variety: Molly, Short-finned molly, Sailfin molly, Mexican sailfin molly



They are omnivore. They consume vegetables and small live foods.

Swimming behavior:

Molly like to swim at the middle and top of the aquarium. For a better view, it is recommended to rear some bottom swimmers.

Live birth:

Molly give birth to babies rather than lay eggs. Therefore, it is recommended to add in some hiding places for baby’s fish to aid in their survival rate.

Aquarium Placement:

Keep away the aquarium from direct sunlight and electronic goods.

Aquarium Stand:

A suitable aquarium stand will safely support your aquarium.

Aquarium Size:

Molly need at least an aquarium size of 45 Liter with surface area being more important than depth.


Decorate the aquarium with plenty of live and bunch plants. However, be sure that the center of the aquarium is free flowing.


They do need well oxygenated water but refuse to have forceful water motion. Can add on filtration system such as hang on filter, internal filter, external filter and etc.


A 6 - 8 hours of light is needed for them and avoid extended exposure of lighting to prevent the growth of algae.


Molly require small amount of salt such as ISTA Guppy Mineral Salt. Add in two teaspoons per 4 liters of water.

Water Temperature:

Always maintain the water temperature in between 21°C - 28°C by using ISTA Thermometer to measure.

Water change:

Advisee water change 10% of your aquarium water. Change at least 25% of aquarium water monthly by using cleaning tools.

General compatibility:

Female Betta, Cory cat, Danios, Minnows, Loach, Plecostomus, Rasbora, Tetra, Guppy, Swordtails and Platy.


Staple diet:

Tetra Guppy, Tetra Min Flake and Tetra Pro complete food with advanced nutrients for all tropical fish are ideal for molly.


With the extra nutrients like carotene from JBL Granomix mini naturally enhance the brilliant colour of molly.


Feed them once a while with JBL Novo GranoColor will help to boost up the immune system instead of only their body coloration.


Depending on the species and size, feed small amounts 1 - 2 times daily, with each time not more than 2 - 3 minutes. Take off the excess fish food with Nirox fish net.


Sign of healthy:

- Clear eye

- Smooth and clean in appearance

- Healthy appetite

- Calm and steady gill movement

- Bright and even colouring

Sign of illness:

- Loss of body colour or appetite

- Lying on the bottom of aquarium

- Poor growth or weight loss

- Frayed fins

- Scraping body on rocks

If you notice any illness sign(s), please to test water quality and improve it if necessary.


- Avoid fish tank from being overcrowded as it may cause stress to fish and a higher chance for them to get sick.

-  Regular water change and an appropriate filtration is needed to maintain a good water quality.

-  Check water quality by using JBL Test Kit at least once a week.

-  Wash hand with soap after each time handling your aquarium.