Does the Blue Phantom Pleco eat aquarium plants?

Generally, no. Provided they are fed a varied and sufficient diet, they will ignore healthy plants. However, they may graze on broad-leaved plants to eat algae off the surface, which can occasionally cause incidental damage to delicate leaves.

Why is my Blue Phantom Pleco hiding all the time?

They are naturally crepuscular and nocturnal, meaning they are most active at dawn, dusk, and during the night. Providing plenty of shaded areas and caves will actually make them feel more secure and likely to venture out during the day.

Can I keep a Blue Phantom Pleco with a Bristlenose Pleco?

It is possible in a very large aquarium with plenty of distinct territories and caves. However, in smaller setups, the larger and territorial Blue Phantom may bully the smaller Bristlenose.

How fast does a Blue Phantom Pleco grow?

They are relatively slow growers. It can take several years for a juvenile to reach its maximum adult size of around 15 to 20 cm.

Do I need a powerhead in a tank with a Blue Phantom Pleco?

Yes, highly recommended. They originate from fast-flowing river rapids, so adding a powerhead or wavemaker ensures the strong current and high oxygen levels they need to thrive.

A striking Blue Phantom Pleco displaying its deep blue body and contrasting lighter spots on a rounded boulder — AI-generated illustration for OneShoal

FreshwaterTropicalIntermediate

Blue Phantom Pleco L128

Hemiancistrus subviridis

The Blue Phantom Pleco (L128) is a striking, fast-water loricariid prized for its deep blue colouration and contrasting spots.

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Ideal Conditions

Temperature: 25 – 30 °C
pH range: 6 – 7.5
Hardness: 2 – 15 dGH
Adult size: 15 – 20 cm
Adult minimum: 200 litres+
Lifespan: 8 – 12 years
Diet: Omnivore with a preference for aufwuchs and vegetable matter; requires high-quality sinking pellets, fresh vegetables, and occasional meaty frozen foods.
Water flow: High
Preferred setup: Riverine biotope with a sandy substrate, smooth water-worn boulders, driftwood, and plenty of secure caves.

About the Blue Phantom Pleco L128

The Blue Phantom Pleco, widely known in the hobby as L128, is a spectacular suckermouth catfish originating from the fast-flowing rapids of the Orinoco River in Venezuela. Closely related to the Green Phantom Pleco (L200), this species is highly sought after for its vivid dark blue base colour adorned with lighter blue or white spots. Growing to around 20 cm, it makes a magnificent, albeit somewhat secretive, centrepiece for larger riverine setups.

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Where Blue Phantom Pleco L128 comes from

Native range

Orinoco River basin

Countries / regions

Venezuela

Habitat

Fast-flowing, highly oxygenated river rapids with rocky substrates and underwater boulders.

Specifically collected in the northern stretches of the Río Orinoco in Venezuela.

Similar species

Green Phantom Pleco L200
Hemiancistrus subviridis
Gold Nugget Pleco L018
Baryancistrus xanthellus
Vampire Pleco L007
Leporacanthicus cf. galaxias

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Cardinal Tetra
Paracheirodon axelrodi
They occupy the middle to upper water column, avoiding the pleco's territory, and thrive in the same warm water.
Great
Sterba's Corydoras
Corydoras sterbai
One of the few Corydoras species that naturally thrives in the higher temperatures preferred by the Blue Phantom.
Great
Eartheater Cichlids
Geophagus altifrons
Large enough to command respect but generally peaceful; they share the same biotope and water requirements.
Great
Green Phantom Pleco L200
Hemiancistrus subviridis
Being conspecifics or closely related, they will compete fiercely for territory and caves unless the aquarium is exceptionally large.
Compatible with caution
Common Goldfish
Carassius auratus
Goldfish are coldwater species that will suffer in the high temperatures and strong currents required by the pleco.
Not recommended

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