Sailfin Molly tank mates
Judge a sailfin setup by the male's dorsal: in hard alkaline water with swimming room it opens like its name; in the standard soft community it clamps flat and the fish fails slowly. This is a water-chemistry purchase before it is a fish purchase.
Common mistakeKeeping sailfin mollies at soft, neutral community water without hardness is how spines bend and fish swim badly within months. They are hard-water livebearers first. Test GH and pH before you blame genetics or disease. If your tap is soft and the rest of the tank is neon tetras, pick a different livebearer plan — or change the water goals entirely.
Each name below opens a pair check with Sailfin Molly. That check is the decision, not the list itself.
Usually safer companions
Conservative shortlist from this profile. Open a pair page before you buy.
The Sailfin Molly profile lists Boesemani Rainbowfish as both safe and a recommended pairing. Boesemani Rainbowfish schools in groups of 6 or more, so plan room for the whole group rather than one fish.
The Sailfin Molly profile lists Molly as both safe and a recommended pairing. Molly is a peaceful beginner-care species with a 80L minimum. Run the pair checker for your specific tank before stocking.
The Sailfin Molly profile lists Platy as both safe and a recommended pairing. Platy is a peaceful beginner-care species with a 60L minimum. Run the pair checker for your specific tank before stocking.
Risky or situational
May work with more water, a mature system, or a species-only setup. Read the pair page before you experiment.
Betta is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Sailfin Molly. Run the pair checker before stocking.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Fish to avoid with Sailfin Molly
Predation, aggression, or space rules on this profile. Treat these as poor default mixes.
Jack Dempsey reaches 25cm and is flagged predatory. Sailfin Molly at 12cm is prey-sized for it. Jack Dempsey is rated aggressive and Sailfin Molly is rated peaceful. No community-style planning carries that gap.
Oscar reaches 35cm and is flagged predatory. Sailfin Molly at 12cm is prey-sized for it. Oscar needs at least 300L, far above the 120L minimum for Sailfin Molly. The tank that houses one stresses the other. Oscar is rated aggressive and Sailfin Molly is rated peaceful. No community-style planning carries that gap.
Tank size and groups
- Published minimum for Sailfin Molly: 120L. Group minimum 3 .
- Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other. That is why pair checks include tank context, not only temperament.
- Nearest litre hub to this minimum: 120L hub.
Easier alternatives to consider
Hardier first-tank names from the library. Still read the profile. Not a substitute for reading this one.
Plan before you buy
Start a pair check with Sailfin Molly, or open a starter plan with the top safer companions in the builder.
Tank hubs: 120L
Related reading
Guides that list other fish with the same trait, so you can plan around the group rather than one row.
- Schooling & group fish →
Plan the group of 3+ before choosing tank mates.
- Beginner-friendly freshwater fish →
Sailfin Molly is on this list. Hardier options for a first stock.
- Peaceful community fish →
Other peaceful species to shortlist beside Sailfin Molly.
Filtration & heating
A 120L minimum tank for Sailfin Molly needs a filter rated for at least 480L/hr turnover and a heater maintaining 22–30°C.
Similar fish (same category)
- Molly · min 80L
- Swordtail · min 80L
- Platy · min 60L
- Endler's Livebearer · min 40L
- Guppy · min 40L
Related (care + temperament)
Other species that list Sailfin Molly
Reverse lookup: these profiles reference Sailfin Molly under safe or “best with” lists.
Sailfin Molly tank mates — quick answers
- What fish can live with Sailfin Molly?
- Usually safer companions on this hub include Boesemani Rainbowfish, Molly, Platy. Open each pair check before you buy — the list is a shortlist, not a guarantee.
- What tank mates should you avoid with Sailfin Molly?
- Avoid Jack Dempsey, Oscar based on size, temperament, or predation risk on this profile.
- What size tank do Sailfin Molly need for a community?
- 120L is the planning floor for adult swimming space and bioload. A 146L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.