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Types of molly fish

Mollies need harder water than most community fish

Mollies come from mineral rich water and are among the few popular aquarium fish that genuinely prefer hard, alkaline conditions. In most Indian cities that is what the tap already provides, which is why they do so well here.

The problems appear in soft water areas, where mollies become prone to shimmying, a distinctive rocking in place without moving forward. That is a water chemistry signal rather than a parasite.

They are also more sensitive to unstable water than guppies or platies. A molly is often the first fish in a community tank to show that something has changed.

Diet and the algae habit

Mollies graze constantly and need real vegetable matter, not just protein flake. A diet that is all protein leads to digestive problems and a bloated look.

Feed a quality flake or pellet with vegetable content, and supplement with blanched spinach, courgette or an algae wafer. Mollies will also graze soft algae off glass and decor, which is a useful habit.

Balloon bodied mollies are the most prone to bloating. Feed them smaller amounts more often and keep vegetable matter in the rotation.

Tank size and group structure

Mollies grow larger than most beginners expect, and sailfins larger still. Forty litres is a realistic minimum for a small group of standard mollies, and more for sailfins.

Keep more females than males. Male mollies pursue females persistently and a poor ratio leaves one female exhausted.

They are livebearers, so expect fry regularly. A well planted tank gives fry somewhere to hide, and it keeps the population growing at a manageable pace.

Do mollies need salt in the tank?

This question comes up constantly because mollies tolerate brackish water in the wild. In a properly maintained freshwater aquarium they do not need added salt.

What they actually need is hardness and mineral content, which people often supply accidentally by adding salt. Crushed coral or a mineral supplement addresses the real requirement without the side effects.

Adding salt to a community tank is a problem for tank mates such as corydoras and many plants, so treat it as a targeted treatment rather than a routine.

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