Is the narrow temperature overlap a problem for this combination?

The 80-82F overlap is tight but workable if you set the heater to 81F and keep other tankmates out. Rams need this range consistently, and Buenos Aires tolerate it without stress. Do not add any fish that prefer cooler water to this setup.

Will Buenos Aires tetras nip at German blue rams?

Unlikely. Rams have short fins and hold their ground as bottom-dwellers. Buenos Aires tetras are more likely to chase each other within their school than bother a 3-inch ram holding territory on the substrate.

How many of each species work well together?

A school of 6 Buenos Aires tetras plus 1-2 German blue rams fills a 30-gallon tank nicely. The tetras use the middle water column while the ram claims the bottom, giving each species its own space.

What water quality does this combination need?

German blue rams need nitrates below 10 ppm and zero ammonia and nitrite at all times. Buenos Aires tetras are more forgiving, tolerating nitrate up to 40 ppm, so meeting the ram standard easily covers both species.

Can Buenos Aires Tetra Live With German Blue Ram?

By Alex WalshLast reviewed Apr 18, 2026

Yes

Yes, Buenos Aires tetras and German blue rams coexist in a 30-gallon tank, though the 2-degree temperature overlap requires running the tank at the warmer end.

Why

Temperature overlap sits at just 80-82F, which means the tank must run warm to accommodate both species comfortably.
Buenos Aires tetras swim actively in the middle of the tank while rams stay near the bottom, so they occupy different zones.
Both species grow to 2-3 inches, creating no significant size difference that would trigger predation.
pH overlap spans 6.0-7.0, suiting both the ram preference for softer water and the Buenos Aires tolerance for a wider range.
Buenos Aires tetras are hardy and tolerate the pristine water conditions rams require without issue.

Minimum shared tank

30 gallons

Shared temperature range

80-82°F

What could go wrong

If the tank runs cooler than 80F to suit other tankmates, the ram will suffer stress and become prone to disease.

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.

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Eheim Jager 200W Thermostat Heater

Holds a steady temperature inside the 80-82°F window both species need.

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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.

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