Can Celestial Pearl Danio (Galaxy Rasbora) and Royal Pleco (L190) Live Together?
Yes, Celestial Pearl Danio (Galaxy Rasbora) and Royal Pleco (L190) are ideal tank mates. Both species share compatible water parameters and peaceful temperaments, making them well-suited for a community aquarium. A minimum tank size of 540 litres is recommended.
At a Glance
Behaviour & Temperament
Celestial Pearl Danio (Galaxy Rasbora) is a peaceful species (2/10), while Royal Pleco (L190) is moderately assertive (5/10). This modest difference means Royal Pleco (L190) may occasionally assert dominance over Celestial Pearl Danio (Galaxy Rasbora).
Celestial Pearl Danio (Galaxy Rasbora) 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.
Worth noting: Royal Pleco (L190) is nocturnal and will be most active after lights-out, naturally reducing daytime encounters.
Water Parameters
The safe temperature window for both species falls between 22°C and 26°C. Aim for the midpoint of this range (around 24.0°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 5–15 dGH. Regular testing will ensure conditions stay within this range. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Celestial Pearl Danio (Galaxy Rasbora) and Royal Pleco (L190) together, plan for an aquarium of at least 540 litres with a minimum length of 150 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.
Providing a mix of open swimming space and sheltered areas with rocks, driftwood, or plants will keep both species comfortable and allow natural behaviour.
Specific environmental needs for this combination include: Plants - Densely covered, Driftwood (Digestion/Hiding). Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Royal Pleco (L190) is a plant destroyer, which conflicts with Celestial Pearl Danio (Galaxy Rasbora)'s requirement for live plants. Compromise where possible or prioritise the more critical need.
Celestial Pearl Danio (Galaxy Rasbora) prefers Low (Still Water) flow while Royal Pleco (L190) needs High (River/Stream) flow. Consider positioning filter outlets and using baffles to create zones of different current intensity within the same tank.
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Frequently Asked Questions
Can Celestial Pearl Danio (Galaxy Rasbora) and Royal Pleco (L190) live together?▾
Yes. Celestial Pearl Danio (Galaxy Rasbora) and Royal Pleco (L190) are considered ideal tank mates. Their water parameters, temperaments, and behaviour profiles are well matched for a community aquarium.
What size tank do Celestial Pearl Danio (Galaxy Rasbora) and Royal Pleco (L190) need?▾
A minimum of 540 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 Celestial Pearl Danio (Galaxy Rasbora) and Royal Pleco (L190) together?▾
Keep the aquarium between 22°C and 26°C. A target of around 24.0°C sits comfortably within both species' preferred ranges.
Are Celestial Pearl Danio (Galaxy Rasbora) or Royal Pleco (L190) aggressive?▾
Celestial Pearl Danio (Galaxy Rasbora) is peaceful (2/10) and Royal Pleco (L190) is moderately assertive (5/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Celestial Pearl Danio (Galaxy Rasbora) and Royal Pleco (L190) need?▾
Both species overlap in the 6.5–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
How do I manage Royal Pleco (L190)'s territorial behaviour?▾
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Royal Pleco (L190) space to claim a territory without encroaching on the other fish's area. Adding décor that divides the tank into distinct zones works especially well.
Does Royal Pleco (L190) being nocturnal affect compatibility?▾
Royal Pleco (L190) 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 Royal Pleco (L190) during evening hours.
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