Minimum Requirements
Tank size: 20 gallons absolute minimum, 30+ preferred. Smaller tanks force fish into constant contact and aggression escalates.
Group size: 5-7 females. Three is too few (the weakest fish gets bullied to death); two is guaranteed to fail. Larger groups dilute aggression.
Heavy planting and multiple sight breaks (driftwood, rocks, tall plants). Females need to escape sight lines from each other.
Selecting Compatible Females
Buy all females at the same time — introducing one later breaks established hierarchy and triggers attacks. Pick similar-sized fish; size differences create immediate dominance fights.
Avoid known aggressive lines (some females are essentially male-aggressive). If your store has a tank of multiple females coexisting, pick from that source.
- ✦Add all fish simultaneously, not one by one.
- ✦Rearrange decor when adding to disrupt territories.
Establishing Hierarchy
First week is critical. Females will chase, flare, and nip — establishing a "pecking order." Light nipping is normal; serious damage (torn fins, bleeding, hiding constantly) means breakup needed.
Have a backup tank ready. About 30% of sorority attempts fail and need to be split. Do not risk losing fish to "see if it works out" — pull aggressors immediately.
When It Works
A successful sorority is mesmerizing — colorful, active, and dynamic. Add cory cats or kuhli loaches for the bottom, neon tetras or rasboras for movement, and you have one of the most beautiful nano-community tanks possible.