Product Details

Longfin Orange/Black Marble Bristlenose – Ancistrus sp.

The Longfin Orange/Black Marble Bristlenose is a striking captive-bred bristlenose catfish with flowing fins and a bold marbled pattern of orange, gold, brown and black. Also sold as the Longfin Marble Bristlenose Pleco, Orange Marble Longfin Bristlenose, Black Marble Longfin Bristlenose or Longfin Bristlenose Catfish, this peaceful loricariid is well suited to mature planted community aquariums with driftwood, caves and clean, stable water. It is a useful algae grazer, but it still needs proper feeding and regular aquarium maintenance.

Key Identification:

Common Name: Longfin Orange/Black Marble Bristlenose
Other Names: Longfin Marble Bristlenose Pleco, Orange Marble Longfin Bristlenose, Black Marble Longfin Bristlenose, Longfin Bristlenose Catfish
Scientific Name: Ancistrus sp.
Older / Trade Name: Ancistrus cf. cirrhosus, Bristlenose Pleco
Strain / Form: Captive-bred longfin orange and black marble ornamental strain
Fish Type: Bristlenose Pleco / Loricariid Catfish
Water Type: Freshwater

Natural Range & Habitat:

Ancistrus bristlenose catfish are native to South America, where different species occur in rivers, streams, tributaries and marginal habitats with submerged wood, stones, roots and grazing surfaces. Some species live in clearer flowing water, while others are found in more turbid or slower-moving habitats.

The Longfin Orange/Black Marble Bristlenose is a captive-bred aquarium strain rather than a wild locality form. Its care should still be based on the needs of bristlenose-type catfish: mature aquariums, stable water, good oxygenation, hiding places and constant access to wood, algae, biofilm and vegetable-based foods.

Appearance & Adult Size:

Longfin Orange/Black Marble Bristlenose have a flattened body, broad head, sucker-type mouth and armoured plates typical of Ancistrus catfish. The colour pattern varies between individuals, but usually combines orange, gold, tan or cream areas with darker black, brown or charcoal marbling across the body and fins.

The longfin form has extended fins that give the fish a more elegant, flowing appearance than standard shortfin bristlenose. Mature males usually develop more obvious bristles on the snout and face, while females may have fewer, shorter or less developed bristles. Adults usually reach around 10–12 cm, with the long fins adding extra visual size.

Aquarium Suitability:

This species is well suited to mature planted aquariums, peaceful community tanks and natural-style setups with driftwood, caves, smooth stones and shaded areas. It spends much of its time grazing surfaces and resting under cover.

Longfin Orange/Black Marble Bristlenose are not suitable for tiny aquariums or brand-new setups with no natural biofilm. They are good algae grazers, but they will not clean the aquarium on their own and must be fed a balanced diet. The long fins also mean extra care should be taken when choosing tank mates and décor.

Recommended Aquarium Size:

A practical minimum is 80–100 litres for a single adult, with a tank length of at least 60–75 cm recommended. Larger aquariums are better for mixed communities or if keeping more than one bristlenose.

Keep one male per small to medium aquarium, as adult males can become territorial over caves. Pairs or groups are best kept only in larger tanks with multiple caves, feeding areas and visual barriers.

Water Conditions:

Temperature: 22–27°C
pH: 6.5–7.8
Hardness: Soft to moderately hard
Additional Notes: Keep water clean, stable and well oxygenated. Provide good filtration, regular water changes and plenty of wood or hard surfaces for grazing. Avoid poor water quality, unstable new aquariums, low-oxygen setups and sharp décor that could damage the long fins.

Temperament & Tank Mates:

Aquarium Category: Community Fish

Longfin Orange/Black Marble Bristlenose are generally peaceful with most community fish, but adult males can be territorial with other bristlenose or similar cave-dwelling plecos. Suitable tank mates include tetras, rasboras, peaceful barbs, livebearers in suitable water, rainbowfish, cory-type catfish, dwarf cichlids and other calm community species.

Avoid large aggressive cichlids, predatory fish, fin-nippers and very boisterous tank mates that may damage the long fins. Also avoid highly competitive bottom dwellers that may prevent the bristlenose from feeding. Do not keep multiple males together in a small aquarium.

Feeding:

Bristlenose catfish are mainly herbivorous to omnivorous grazers. Offer algae wafers, spirulina tablets, vegetable-based sinking foods and quality pleco pellets as the staple diet.

Supplement with blanched courgette, cucumber, spinach, kale, shelled peas or other suitable vegetables. Occasional protein foods such as bloodworm, daphnia, brineshrimp or sinking carnivore foods can be offered, but the diet should remain mostly vegetable-based. Remove uneaten vegetables before they spoil the water.

Behaviour in the Aquarium:

This is a bottom and surface-grazing catfish that spends much of its time attached to wood, glass, rocks or plant leaves. It may be more active in the evening, although settled individuals often become visible during the day, especially at feeding time.

Males may claim caves and defend them from other bristlenose. Breeding can occur in mature aquariums, with the male guarding eggs inside a cave or hollow until the fry hatch and become free-swimming.

Care Notes:

Provide driftwood, caves and a mature aquarium with stable water quality. Wood is strongly recommended, as bristlenose catfish graze on wood surfaces and biofilm as part of their natural behaviour.

Do not rely on this fish to survive on algae alone. Feed vegetable-based foods regularly and keep the substrate clean, as plecos produce a noticeable amount of waste. Protect the long fins from fin-nipping fish, sharp décor and strong turbulent flow. Avoid overcrowding the bottom of the aquarium with too many territorial catfish.

Recommended For:

Beginner to intermediate

Availability:

Common to occasional / Captive-bred ornamental strain

Image Disclaimer:

All images are a visual representation of the fish you will receive, made to be as accurate as possible. Natural variation in size, colour, pattern, fin length, fin shape, body tone and markings can occur between individual fish.