Can I keep a bristlenose pleco in an unheated goldfish tank?

Only if your room stays consistently at 73-81F year-round. Most homes drop below that at night in winter, and the pleco suffers.

What temperature range can both species survive in?

Neither species does well in the overlap zone around 72F. Goldfish find it too warm for long-term health, and bristlenose find it marginal.

Is there a pleco that works with goldfish?

Hillstream loaches tolerate cooler temperatures better but have different care requirements. For algae control in a goldfish tank, consider adding more plants or reducing fish load instead.

Can Bristlenose Pleco Live With Goldfish?

By Alex WalshLast reviewed Apr 18, 2026

No, bristlenose plecos need 73-81F while goldfish prefer 60-72F, making this temperature conflict impossible to resolve.

Why

Bristlenose plecos originate from South American rivers and require 73-81F for long-term health.
Goldfish are coldwater fish that thrive at 60-72F and struggle when temperatures exceed 75F.
These temperature ranges have no overlap, so one species will always be stressed regardless of tank setup.
Bristlenose plecos also produce significant bioload and need wood and vegetable matter that goldfish tanks do not provide.
Cooling a tropical tank or warming a goldfish tank both lead to chronic stress and disease in one of the species.

Minimum shared tank

30 gallons

What could go wrong

The goldfish overheats and suffers metabolic stress, or the pleco cools down and becomes prone to parasites and infection.

If you keep them in separate tanks

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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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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Better pairings to consider

Goldfish thrive in coldwater community tanks with white clouds, rosy barbs, and dojo loaches. Bristlenose plecos thrive in tropical tanks with tetras, corydoras, and peaceful cichlids.