Peppermint Bristlenose

Ancistrus dolichopterus

Also known as: Peppermint pleco, Starlight bristlenose, Dolly pleco, L183

Water Parameters

• Temperature: 23–28°C
• pH: 5.5–7
• Hardness (GH): 18–143 ppm (1–8 dGH)

Values above are general hardness (GH). For carbonate hardness (KH), the buffer that keeps pH stable, see the water parameters guide.

Care Summary

The peppermint bristlenose is a striking, locally-bred favourite in Australia: jet-black and dusted with bright white spots, the pattern boldest in juveniles and softening to a scatter of stars with age, often finished with a fine white edge to the fins. Despite the name it is a true bristlenose, the mature males growing the same bushy snout tentacles, but PlanetCatfish identifies the Australian peppermint bristlenose as Ancistrus dolichopterus (L183), a distinct species from the common brown bristlenose rather than a colour morph of it. That distinction matters in the tank: where the common bristlenose shrugs off almost any water, the peppermint is a soft, acidic blackwater fish, happiest around pH 5.5 to 7.0, and it can be a little delicate in the hard, alkaline tap water found across much of Australia. Give it soft, clean, well-oxygenated water, bogwood to rasp on, caves to shelter and breed in, and a diet of algae, vegetables, and the occasional sinking wafer. A beautiful and genuinely useful algae eater, and a more colourful alternative to the standard bristlenose for a soft-water community.

Tankmates

A peaceful, hard-working algae grazer for a soft-water community of small tetras, rasboras, dwarf cichlids such as German blue rams, and corydoras. Males are territorial towards other male bristlenose, so keep one male per tank and give it a cave and bogwood. Unlike the bombproof common bristlenose, it wants soft, slightly acidic water and can weaken in the hard, alkaline tap water common across much of Australia. Safe with adult shrimp and snails. Avoid large or aggressive cichlids and persistent fin-nippers.

Compatible with

• Cardinal Tetra
• Neon Tetra
• Rummynose Tetra
• Harlequin Rasbora
• German Blue Ram
• Sterbai Corydoras
• Otocinclus
• Cherry Shrimp

Avoid keeping with

• Large Cichlids
• Fin Nippers
• Other Bristlenose Pleco Males
• Aggressive Tankmates

Common Problems

• being kept in hard, alkaline water when it prefers soft and acidic conditions
• being underfed on algae without supplementary vegetables and wood
• male territorial disputes with other bristlenose over caves
• sensitivity as a blackwater species if water quality slips

Sources: planetcatfish.com, seriouslyfish.com · Last updated: 2026-10-04