Can Green Phantom Pleco (L200) and Royal Pleco (L190) Live Together?

Possible with Caution

Keeping Green Phantom Pleco (L200) and Royal Pleco (L190) together is possible but requires caution due to potential behavioral clashes. Provide a spacious tank of at least 450 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.


At a Glance

Green Phantom Pleco (L200)

Hemiancistrus subviridis

Royal Pleco (L190)

Panaque nigrolineatus

🐟Family Group
Green Phantom Pleco (L200)
Catfish
Royal Pleco (L190)
Catfish
Temperament
Green Phantom Pleco (L200)
Semi-Aggressive (5/10)
Royal Pleco (L190)
Semi-Aggressive (5/10)
Temperature
βœ“ Compatible
Green Phantom Pleco (L200)
25–30Β°C
Royal Pleco (L190)
22–28Β°C
pH Range
βœ“ Compatible
Green Phantom Pleco (L200)
6–7.5
Royal Pleco (L190)
6.5–7.5
Hardness (dGH)
βœ“ Compatible
Green Phantom Pleco (L200)
2–12
Royal Pleco (L190)
5–15
Water Type
βœ“ Compatible
Green Phantom Pleco (L200)
Freshwater Only
Royal Pleco (L190)
Freshwater Only
Flow Preference
βœ“ Compatible
Green Phantom Pleco (L200)
High
Royal Pleco (L190)
High
Min Tank Volume
Combined: 450 L
Green Phantom Pleco (L200)
250 L
Royal Pleco (L190)
450 L
Swimming Level
Shared: 1 zone
Green Phantom Pleco (L200)
Bottom
Royal Pleco (L190)
Bottom
🏷️Behavior Tags
Green Phantom Pleco (L200)
Territorial (Defends specific area)Aggressive to same species/look-alikesShy / Slow Moving (Easily Stressed)NocturnalPlant Destroyer
Royal Pleco (L190)
Territorial (Defends specific area)NocturnalAggressive to same species/look-alikesPlant Destroyer
Stocking calculator

Can your tank handle Green Phantom Pleco (L200) and Royal Pleco (L190)?

Compatibility is only part of the answer. Test both fish with your real tank size, current stock, and maintenance needs to see if you have enough space and a safe stocking level before you add them.

Green Phantom Pleco (L200)
Royal Pleco (L190)
Test both in my tank

Behaviour & Temperament

Both Green Phantom Pleco (L200) and Royal Pleco (L190) are moderately assertive species with an aggression score of 5/10. Their matching temperaments mean neither fish is likely to dominate the other in a shared aquarium.

Green Phantom Pleco (L200) and Royal Pleco (L190) both frequent the Bottom (Substrate) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.

Additional behavioural considerations to keep in mind: Two territorial species may clash over territory, especially in smaller tanks.

Worth noting: Green Phantom Pleco (L200) is nocturnal and will be most active after lights-out, naturally reducing daytime encounters.

To improve the chances of a peaceful coexistence in this community tank: Provide a significantly larger tank (at least 50% more volume than the minimum) to allow both Green Phantom Pleco (L200) and Royal Pleco (L190) to establish separate territories. Add plenty of line-of-sight breaks using driftwood, rocks, and dense planting to reduce territorial confrontations.

Water Parameters

The safe temperature window for both species falls between 25Β°C and 28Β°C. Aim for the midpoint of this range (around 26.5Β°C) for optimal comfort.

Both fish can tolerate a pH between 6.5 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 5–12 dGH. Regular testing will ensure conditions stay within this range.

Tank Setup

To house Green Phantom Pleco (L200) and Royal Pleco (L190) together, plan for an aquarium of at least 450 litres with a minimum length of 150 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

Because this pairing requires extra vigilance, include plenty of hiding spots β€” caves, driftwood, and dense plant clusters β€” so the less dominant fish can retreat when needed.

Specific environmental needs for this combination include: Driftwood (Digestion/Hiding), Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.

Both species do well with high (river/stream) water movement, so a standard filtration setup rated for the tank volume should suffice.

Suitable Tank Sizes

Standard aquarium sizes large enough for both Green Phantom Pleco (L200) and Royal Pleco (L190).

Frequently Asked Questions

Can Green Phantom Pleco (L200) and Royal Pleco (L190) live together?

They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 450 litres), plenty of hiding spots, and watch for signs of stress or aggression.

What size tank do Green Phantom Pleco (L200) and Royal Pleco (L190) need?

A minimum of 450 litres (tank length at least 150 cm) is recommended. This provides enough space for both species to establish their own areas and reduces the likelihood of territorial disputes.

What water temperature is best for Green Phantom Pleco (L200) and Royal Pleco (L190) together?

Keep the aquarium between 25Β°C and 28Β°C. A target of around 26.5Β°C sits comfortably within both species' preferred ranges.

Are Green Phantom Pleco (L200) or Royal Pleco (L190) aggressive?

Green Phantom Pleco (L200) is moderately assertive (5/10) and Royal Pleco (L190) is moderately assertive (5/10). Their similar temperaments generally lead to a peaceful coexistence.

What pH do Green Phantom Pleco (L200) and Royal Pleco (L190) need?

Both species overlap in the 6.5–7.5 pH range. Consistency is key β€” avoid sudden swings, and test regularly to stay within this window.

How do I manage Green Phantom Pleco (L200)'s territorial behaviour?

Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Green Phantom Pleco (L200) space to claim a territory without encroaching on the other fish's area. Adding dΓ©cor that divides the tank into distinct zones works especially well.

Does Green Phantom Pleco (L200) being nocturnal affect compatibility?

Green Phantom Pleco (L200) is most active after lights-out, which naturally reduces daytime encounters with its tank mate. This can actually be beneficial, as both fish get undisturbed time to feed and explore. Just ensure food reaches Green Phantom Pleco (L200) during evening hours.


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