Molly
Poecilia sphenopsMolly (Poecilia sphenops) is a social community species for a cycled 30+ gallon freshwater aquarium. Plan for about 4.5 inches as an adult, 75-82°F water, pH 7.5-8.5, and moderate care. Keep a group of at least 3; larger groups often behave more naturally when the tank has room.

Water Range
- pH
- 7.5-8.5
- GH
- 15-30 dGH
- KH
- 8-20 dKH
Behavior
- Temperament
- Peaceful
- Fin nipping
- 0/5
- Territory
- 0/5
Diet and Care
- Diet
- omnivore/algae grazer
- Diet difficulty
- 2/5
- Care difficulty
- 3/5
Planning Notes
Moderate care needs; may require mature grazing surfaces or supplemental fresh/frozen foods.
This species may need live, frozen, fresh, or otherwise specialized foods.
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Run Molly through the checker with your tank size, cycle status, water, group count, and tankmates before buying.
Check my tankCompare this speciesPut Molly beside another profile to compare water range, size, diet, schooling needs, and behavior.
Open comparisonWill plants work?Match Molly against aquarium plants for nibbling, uprooting, cover, flow, and water-range flags.
Open plant matchAsk about my setupAsk Advisor how Molly fits with your current tank, recent logs, plants, and livestock.
Ask AdvisorView native rangeOpen the origins map to see reviewed native-range coordinates and regional context for Molly.
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