The Green Phantom Pleco (Hemiancistrus subviridis) is a medium-sized, peaceful freshwater catfish with an olive-green to metallic green body. Known for its algae-grazing habits and nocturnal behavior, it is ideal for planted and community aquariums.
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The Green Phantom Pleco (Hemiancistrus subviridis) is a medium-sized, peaceful freshwater catfish with an olive-green to metallic green body. Known for its algae-grazing habits and nocturnal behavior, it is ideal for planted and community aquariums.
Flattened, armored body with olive-green to metallic green coloration. Broad pectoral fins and a large sucker mouth for grazing. Adults reach 6–8 inches, with males slightly more robust and showing more vivid coloration during breeding periods.
10–15 years with proper care
Omnivorous; primarily grazes on 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.
Green Phantom Plecos are excellent for aquarists seeking a visually striking, peaceful bottom-dweller for community aquariums. Their nocturnal algae-grazing behavior, metallic green 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 subviridis
Loricariidae
South America – Brazil, fast-flowing rivers and tributaries 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. Occasionally provide protein-rich foods such as bloodworms, brine shrimp, or shrimp pellets. 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 or bacterial infections if stressed. Requires stable water parameters and a balanced diet.
Peaceful and nocturnal; spends most of the day hiding under driftwood, rocks, or caves. Becomes more active at night, grazing along surfaces. Compatible with medium to large community fish that are non-aggressive.
The Green Phantom Pleco is native to fast-flowing rivers in South America, particularly in Brazil. Its striking metallic green coloration and peaceful nature make it highly desirable for aquarists. Adult fish reach 6–8 inches, making them manageable in medium to large aquariums. They thrive in tanks with hiding spots, driftwood, and moderate water flow, grazing on algae and biofilm. Providing a varied diet and stable water parameters ensures their health, vibrant coloration, and active behavior.