Can Congo Tetra Live With Denison Barb?
Yes, Congo tetras and Denison barbs coexist well in 30 gallons or larger because both are active, peaceful schooling fish with overlapping temperature and pH requirements.
Why
- Congo tetras grow to 3-3.5 inches while Denison barbs reach 4-5 inches, so they are similar enough in size that neither intimidates the other.
- Temperature overlap of 73-77°F suits both species without any special heating adjustments.
- pH range of 6.5-7.5 covers slightly acidic to neutral water, which matches what both species prefer in the wild.
- Both species are schooling fish that do better in groups of 5 or more, encouraging natural behavior.
- Denison barbs occupy the mid-level while Congo tetras swim in the middle to upper levels, creating complementary school zones.
What could go wrong
Denison barbs are fast swimmers that may outcompete Congo tetras for food. Use a slow-feeding ring or spread food across the surface to ensure all fish eat.
Gear for a shared tank
Sized for the 30 gallon minimum this pairing needs. Affiliate links — we earn a small commission if you buy through them.
AquaClear 70 Power Filter
Oversized filtration is what lets you stock two species together without water quality crashing. Rated for a tank slightly larger than the 30 gallon minimum.
Eheim Jager 200W Thermostat Heater
Holds a steady temperature inside the 73-77°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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