Can Harlequin Rasbora Live With Rummy Nose Tetra?
Yes, harlequin rasboras and rummy nose tetras coexist well in 20 gallons or larger, with matching water chemistry and complementary schooling behavior.
Why
- Harlequin rasboras reach 2 inches and rummy nose tetras grow to 2-2.5 inches.
- Both species school in the middle water column and form coordinated groups that move together.
- Temperature overlap of 75-82F suits harlequins fully and rummy noses at the lower end.
- Both species prefer soft, slightly acidic water in the 6-7 pH range.
- Neither species nips fins or displays aggression toward the other.
What could go wrong
Rummy nose tetras are more demanding about water quality. The red nose fades quickly if ammonia spikes or pH shifts occur.
Gear for a shared tank
Sized for the 20 gallon minimum this pairing needs. Affiliate links — we earn a small commission if you buy through them.
AquaClear 30 Power Filter
Oversized filtration is what lets you stock two species together without water quality crashing. Rated for a tank slightly larger than the 20 gallon minimum.
Eheim Jager 150W Thermostat Heater
Holds a steady temperature inside the 75-82°F window both species need.
API Freshwater Master Test Kit
Keep ammonia, nitrite, and nitrate in check. Two-species tanks have more bioload and less margin for error than single-species setups.
Related compatibility questions
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