Harlequin Rasbora
Trigonostigma heteromorpha compatibility profile. Find the best tank mates by checking water parameters, aquarium swim zone pressure, social rules, and shrimp-safe verifications.
Core facts & bioload limits
Adult size2"
Minimum tank10 gal
Temperamentpeaceful
Group6+
- temperature72-80F
- pH6-7.8
- water_hardnessGH 2-12 dGH | KH 1-6 dKH
- plant_safetysafe
- shrimp_safetycaution
- algae_eating_rolenone
- beginner_suitabilitybeginner
Community planning & swim zone pressure
When planning a community around Harlequin Rasbora, consider the aquarium swim zone pressure. This species primarily occupies the topmiddle zone. Balance the setup by choosing tank mates that occupy the top or bottom zones to reduce crowding and stress.
Care caveats
- notesPeaceful, easy-going schooling rasbora that thrives in calm tropical community tanks.
- caveatKeep a group of 6 or more; alone or in trios they hide and stop displaying their natural shoaling behavior.
- caveatBest mixed with other peaceful tropicals; avoid pairing with aggressive fin-nippers (tiger barb, serpae tetra) or species large enough to swallow them.
- caveatAdd only to a cycled, stable tropical tank — hardy once established but still sensitive to ammonia spikes during cycling.
- caveatStays in the middle to upper zone; balance the layout with calm bottom-dwellers rather than other middle-zone crowders.
Compatible tank mates
- Bladder Snailyellowschooling_size_issue | minimum 10 galCheck this pair in the planner ->
- Bettayellowschooling_size_issue | minimum 10 galCheck this pair in the planner ->
- Chili Rasborayellowschooling_size_issue | minimum 10 galCheck this pair in the planner ->
- Ember Tetrayellowschooling_size_issue | minimum 10 galCheck this pair in the planner ->
- Cherry Shrimpyellowshrimp_predation_risk | minimum 10 galCheck this pair in the planner ->
- Ghost Shrimpyellowshrimp_predation_risk | minimum 10 galCheck this pair in the planner ->
- Crystal Red Shrimpyellowshrimp_predation_risk | minimum 10 galCheck this pair in the planner ->
- Blue Dream Shrimpyellowshrimp_predation_risk | minimum 10 galCheck this pair in the planner ->
- Orange Sakura Shrimpyellowshrimp_predation_risk | minimum 10 galCheck this pair in the planner ->
- Black Rose Shrimpyellowshrimp_predation_risk | minimum 10 galCheck this pair in the planner ->