L200 Green Phantom Pleco
Hemiancistrus subviridis
Min Tank Size
150L
Adult Size
18 cm
Lifespan
12 years
About
Hailing from the Orinoco River drainage in Colombia and Venezuela, the L200 Green Phantom is one of those plecos that makes people do a double-take. That olive base covered in vivid lime-green or yellow-green spots doesn't look real under bright lighting, and a healthy adult in a well-maintained tank genuinely turns heads. They top out around 17 to 18 centimeters, so they're a medium-sized pleco rather than a monster, which makes them accessible for a wider range of setups than many of their relatives.
These fish come from fast-moving, highly oxygenated rivers with warm temperatures, and they simply won't thrive without replicating that. Temperature in the 26 to 30 Celsius range, a pH on the softer and more acidic side between 6.0 and 7.2, and genuinely strong current are non-negotiable. A powerhead or wavemaker alongside a quality canister filter is the usual approach. The water also needs to stay clean. They're sensitive to organic waste accumulation despite being relatively manageable in terms of bioload compared to larger plecos.
Diet is primarily plant matter and biofilm. Zucchini, cucumber, blanched spinach, and high-quality algae wafers should form the core of their feeding routine, supplemented occasionally with protein-rich foods. A tank with established algae growth and driftwood for rasping gives them natural grazing opportunities that keep them active and healthy.
Temperamentally they're peaceful toward most community fish but can be seriously territorial with other bottom dwellers, especially other plecos. Multiple caves and broken lines of sight help, but in smaller tanks confrontations are nearly inevitable.
Browse tank journals and build threads featuring this species and you'll see just how dramatic a centerpiece fish a single well-kept L200 can become.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple L200 Green Phantom Pleco together
L200 Green Phantom Pleco is strongly territorial. Multiples fight over space unless the tank is large enough for each to claim its own area. A single individual is the safer default.
Compatibility
L200s do well with active midwater fish that share their warm, well-oxygenated water requirements. Colombian tetras, bleeding heart tetras, severums, and geophagus species make natural geographic and environmental matches. Avoid housing them with other large or territorial plecos unless the tank is very large and heavily decorated. Small nano fish are usually ignored by adult L200s but could potentially be at risk with very small shrimp. Cory catfish can coexist if there's enough bottom real estate, though the pleco may occasionally chase them from favored resting spots.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The single biggest mistake beginners make is underestimating the flow and oxygen requirements. An L200 in a slow-moving, under-filtered tank will decline slowly and then suddenly. A second common error is relying on algae wafers alone without fresh vegetables. They need regular blanched greens and ideally some driftwood to rasp. Temperature drops below 25 Celsius will suppress their immune system quickly. Acclimation from the bag should be done slowly, as they're sensitive to sudden parameter shifts coming from dealer tanks that may not match your water.
Behavior & Aggression
The L200 directs almost all of its aggression downward, toward other bottom-dwelling fish competing for the same cave space. Two males in a tank without ample territory will clash repeatedly, and injuries can result. Even females can be territorial toward each other. Aggression escalates at feeding time and when one fish is occupying a cave the other wants. Providing multiple caves, flat rocks, and driftwood to break up sightlines reduces conflict significantly. They're generally completely indifferent to midwater and upper-level fish.
Things to Know
- Highly territorial toward other plecos, especially conspecifics. Provide caves.
- Needs strong oxygenation and flow. Inadequate O2 is a common killer.
- Will pick at tender-leaved plants when biofilm grazing opportunities are limited.
- Keep singly, very territorial with other plecos.
- Requires high water flow and excellent oxygenation.
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