Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

These pencilfish are highly peaceful but can be somewhat skittish in sparse environments. They must be kept in groups of at least six to feel confident and display natural behavior. In appropriate numbers, they will actively interact and explore their surroundings.

Diet

Micro-predator

Their natural diet consists primarily of small insects and tiny crustaceans. In a home aquarium, they will eagerly consume finely crushed flakes and suitably sized pellets. Supplementing their diet with live or frozen daphnia and cyclops brings out their best colors.

Sex ratio

Group

Males are generally more colorful and have additional red markings compared to females. Keeping a ratio with more females than males reduces competitive stress. A balanced group minimizes territorial squabbles among males during spawning behavior.

Feeding frequency

Twice daily

Due to their high energy levels and small stomachs, they require frequent, small meals. Providing food two to three times a day is ideal for their metabolism. Ensure that the food particles are small enough to fit into their tiny, upturned mouths.

Bioload

Low

The Three-lined pencilfish carries a very light bioload, contributing little to the nitrogen cycle. They are small and highly active, but their waste production remains minimal. This characteristic is perfect for maintaining pristine water conditions in planted tanks.

Flow

Strong

They originate from sluggish waters and therefore prefer a gentle to moderate current. Too much flow will force them to expend unnecessary energy and cause fatigue. Strategic placement of driftwood and plants can create calm resting areas.

Jump risk

Yes

These fish are notorious jumpers, especially during feeding or when frightened. A completely secure and tightly fitting aquarium hood is a strict requirement. Floating plants can also help deter them from leaping out of the water.

Reproduction

Oviparous

Breeding Three-lined pencilfish can be tricky, demanding very soft water and dim lighting. They scatter their adhesive eggs among fine-leaved plants or spawning mops. The parents will eagerly eat their own eggs, so prompt removal of the adults is necessary.

Compatibility & tankmates

Peaceful

This is a peaceful community fish that thrives alongside other gentle species. It is important to avoid housing them with fin-nippers or large, predatory fish. Excellent companions include small tetras, Corydoras, and peaceful dwarf cichlids.

Tank level

Top/Middle

They are predominantly top and mid-water dwellers in the aquarium. They can often be seen cruising near the surface looking for floating food particles. Including tall plants provides them with necessary cover in their preferred swimming zones.