I have 8 tiger barbs in a 30-gallon tank. Will they leave my guppies alone?

Large schools of 8+ reduce but do not eliminate nipping. The barbs will direct most chasing at each other during play and dominance displays, but guppies remain targets during feeding or when the school splits. The risk is real and ongoing.

Can I keep only female guppies to avoid the long colorful tails?

Female guppies have shorter tails and duller colors, which reduces triggers. Tiger barbs may still chase them, but the damage is slower. Female guppies are still at risk during the initial harassment period before the school settles.

What tank size would make this pairing work?

No tank size makes this reliable. Tiger barbs will chase guppies in any size tank. The only real solution is removing one species or the other.

Can Guppy Live With Tiger Barb?

By Alex WalshLast reviewed Apr 18, 2026

No, tiger barbs systematically nip guppy fins, especially the long flowing tails of males, and this happens even in well-planted tanks.

Why

Tiger barbs reach 3 inches and are fast, active swimmers. Guppies stay at 1-2.5 inches with much slower movement, making them easy targets for harassment.
Male guppies have long, flowing tails that tiger barbs find irresistible. The barb will chase the guppy, latch onto the tail edge, and tear the fin over multiple sessions.
Tiger barbs need groups of at least 6 to redirect nipping at each other instead of tankmates, but in smaller groups or during feeding frenzies they target guppies consistently.
Guppies are top swimmers while tiger barbs occupy the middle level, but barbs will chase upward to reach guppy fins. Plants provide limited protection since the barbs work quickly.
Once a guppy has damaged fins, secondary infection sets in and the fish rarely recovers fully even if the barbs are removed later.

Minimum shared tank

20 gallons

Shared temperature range

74-79°F

What could go wrong

Tiger barbs will shred a guppy's fins within days of introduction. Damaged fins lead to infection, color loss, and stress that kills the guppy before you can catch and separate the fish.

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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Eheim Jager 150W Thermostat Heater

Holds a steady temperature inside the 74-79°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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