The Blue Phantom Pleco (Hemiancistrus sp. L-128) is a medium-sized, peaceful freshwater catfish known for its striking iridescent blue-black body and unique nocturnal behavior. It is an excellent algae grazer and adds visual interest to community aquariums.
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The Blue Phantom Pleco (Hemiancistrus sp. L-128) is a medium-sized, peaceful freshwater catfish known for its striking iridescent blue-black body and unique nocturnal behavior. It is an excellent algae grazer and adds visual interest to community aquariums.
Flattened, armored body with an iridescent blue-black coloration. Broad pectoral fins and a large sucker mouth for grazing on algae. Adults reach 6–8 inches. Juveniles may display lighter spotting that darkens with age.
10–15 years with proper care
Omnivorous; primarily consumes algae and biofilm. Supplement with sinking algae wafers, blanched vegetables (zucchini, cucumber, spinach), and occasional protein-rich foods such as bloodworms, brine shrimp, or shrimp pellets.
Blue Phantom Plecos are ideal for aquarists seeking a visually striking, peaceful bottom-dweller for medium to large community aquariums. Their nocturnal algae-grazing behavior, vibrant coloration, and manageable size make them a fascinating and functional addition.
Moderate – hardy but requires proper diet, hiding spaces, and stable water conditions.
40–55 gallons (larger recommended for multiple individuals or community setups)
6.5 to 7.5
5–15 dGH
74–82°F (23–28°C)
6–8 inches
Peaceful community fish such as tetras, rasboras, dwarf cichlids, gouramis, and other non-aggressive species. Avoid aggressive or very small fish.
Aggressive fish or very small species that may be stressed or outcompeted for food. Avoid overcrowding or highly territorial species.
Hemiancistrus sp. L-128
Loricariidae
South America – fast-flowing rivers and tributaries, often with rocky substrates and driftwood.
Semi-solitary; peaceful with other species. Males may display mild territorial behavior in caves but generally coexist well in community aquariums.
Feed primarily on algae wafers and biofilm. Supplement with blanched vegetables such as zucchini, cucumber, and spinach. Offer occasional protein-rich foods such as bloodworms or brine shrimp. Ensure food reaches the bottom where they feed.
pH: 6.5–7.5, Temperature: 74–82°F (23–28°C), Hardness: 5–15 dGH, Ammonia/Nitrite: 0 ppm, Nitrate: <20 ppm
Sensitive to poor water quality; can develop ich, bacterial infections, or barbel damage if stressed. Requires stable water parameters and balanced diet.
Peaceful and nocturnal; spends most of the day hiding under rocks, driftwood, or caves and becomes more active at night. Compatible with medium to large community fish that are non-aggressive.
The Blue Phantom Pleco is native to fast-flowing rivers in South America. Its striking metallic blue sheen makes it a highly desirable addition to community aquariums. Adult fish reach around 6–8 inches, making them manageable in medium to large tanks. They are hardy, peaceful, and effective algae grazers, but require hiding spots such as driftwood and rocks to feel secure. Providing natural décor, moderate water flow, and a varied diet ensures their long-term health, vibrant coloration, and active behavior.