Can I keep a hillstream loach in a betta tank with a heater?

No. Most betta tanks run at 78-80F, which is above the 75F upper limit for hillstream loaches. Prolonged exposure to temperatures above 78F causes stress and health decline in loaches.

Do hillstream loaches need a heater?

They do not need one and should not have one. In fact, a heater in a hillstream loach tank is a risk if the thermostat sticks in summer. They prefer 65-75F and do best without supplemental heating in most homes.

What do hillstream loaches eat?

They graze on biofilm, algae, and microorganisms from rocks. Supplement with sinking algae wafers, blanched zucchini, or Repashy gel foods smeared on rocks. Watch their belly shape to confirm they are eating.

Can Betta Fish Live With Hillstream Loach?

By Alex WalshLast reviewed Apr 18, 2026

No, bettas need warm 76-82F still water while hillstream loaches need cool 65-75F fast-flowing water, and these requirements are incompatible in every way.

Why

Betta fish need 76-82 degrees Fahrenheit, which is 6-10 degrees warmer than the 65-75 degrees hillstream loaches require.
Hillstream loaches need high water flow from a powerhead to feel at home, and bettas are not strong swimmers that stress in strong current.
Hillstream loaches come from fast-flowing mountain streams with cool, oxygen-rich water, and sustained temperatures above 78F cause stress and long-term decline.
Bettas come from still or slow-moving water in warm tropical conditions, so compromise on temperature or flow hurts one or both species.

Minimum shared tank

20 gallons

What could go wrong

If the tank runs warm enough for the betta, the hillstream loach overheats and stops eating. If it runs cool enough for the loach, the betta chills and becomes prone to disease.

If you keep them in separate tanks

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.

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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

Bettas do well with bronze corydoras in a 10-gallon heated tank. Hillstream loaches do well with zebra danios, cherry barbs, and ember tetras in a cool 30-gallon river-style setup.