Will a Jack Dempsey be aggressive toward a bala shark?

Jack Dempseys can be territorial but they are not typically aggressive toward large, fast-swimming tankmates like bala sharks. A bala shark is too large and quick to be bullied effectively. The main concern is the Dempsey establishing territory near structures where the shark might pass through.

What tank size do I need for both species?

75 gallons is the minimum for one bala shark and one Jack Dempsey. Both species grow large and active, so larger tanks of 100+ gallons are better long-term. A single bala shark needs at least 72 inches of swimming length as an adult.

Can I keep more than one of each species together?

You can keep a small group of 2-3 bala sharks, but only one Jack Dempsey in a 75-gallon tank. Multiple Dempseys are highly territorial and will fight. If you want multiple Dempseys, you need a 100+ gallon tank with careful aquascaping for sight breaks.

Can Bala Shark Live With Jack Dempsey?

By Alex WalshLast reviewed Apr 18, 2026

Yes

Yes, bala sharks and Jack Dempsey cichlids coexist well in 75 gallons or larger with wide parameter overlaps and similar activity levels.

Why

Bala sharks grow to about 12 inches and Jack Dempseys reach 10-12 inches, so both species end up similar in adult size, eliminating predation risk.
Both species tolerate wide temperature ranges of 72-82F and pH ranges of 6.5-8, giving significant flexibility in water chemistry.
Bala sharks are active mid-level swimmers while Jack Dempseys establish territories near the bottom, so they use different zones of the tank.
Both species are large enough to hold their own; neither will be bullied by the other in a properly sized tank.
A 75-gallon tank provides enough room for both species to coexist without constant territorial pressure.

Minimum shared tank

75 gallons

Shared temperature range

72-82°F

What could go wrong

Both species produce significant bioload, so hardy filtration and weekly water changes of 25-30 percent are essential to maintain water quality.

Gear for a shared tank

Sized for the 75 gallon minimum this pairing needs. Affiliate links — we earn a small commission if you buy through them.

Fluval 307 Performance Canister Filter

Oversized filtration is what lets you stock two species together without water quality crashing. Rated for a tank slightly larger than the 75 gallon minimum.

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Eheim Jager 300W Thermostat Heater

Holds a steady temperature inside the 72-82°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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