Can Cardinal Shrimp (Sulawesi) and German Blue Ram Live Together?
Cardinal Shrimp (Sulawesi) and German Blue Ram are not recommended as tank mates due to conflicting pH requirements. Housing these species together is likely to result in stress, health problems, or direct harm to one or both fish.
At a Glance
Can your tank handle Cardinal Shrimp (Sulawesi) and German Blue Ram?
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.
Behaviour & Temperament
Cardinal Shrimp (Sulawesi) is a peaceful species (0/10), while German Blue Ram is generally mild-mannered (4/10). This notable difference means German Blue Ram may occasionally assert dominance over Cardinal Shrimp (Sulawesi).
Cardinal Shrimp (Sulawesi) and German Blue Ram 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.
Water Parameters
The safe temperature window for both species falls between 27°C and 30°C. Aim for the midpoint of this range (around 28.5°C) for optimal comfort.
The pH requirements of Cardinal Shrimp (Sulawesi) (7.5–8.5) and German Blue Ram (5–7) do not overlap, making it impossible to satisfy both species simultaneously.
For general hardness, the shared comfort zone is 4–8 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Cardinal Shrimp (Sulawesi) and German Blue Ram together, plan for an aquarium of at least 60 litres with a minimum length of 60 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.
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: Established Algae (Otocinclus), Smooth Gravel (Sensitive Barbels), Sand (Sifters), Plants - Densely covered, Driftwood (Digestion/Hiding), Leaf Litter/Blackwater. Meeting these requirements will help both species thrive.
Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.
Why This Pairing Usually Fails in Practice
Cardinal Shrimp (Sulawesi) and German Blue Ram are the kind of pair that can look acceptable in a shop but become a maintenance problem at home. The main risk is not a single number in the chart; it is the way incompatible behavior, water needs, or pressure on space compounds over time once both fish are established in the same tank.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Cardinal Shrimp (Sulawesi) and German Blue Ram.
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
36 Gallon Bowfront
40 Gallon Breeder
Show 19 more tank sizes
Frequently Asked Questions
Can Cardinal Shrimp (Sulawesi) and German Blue Ram live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Cardinal Shrimp (Sulawesi) and German Blue Ram need?
A minimum of 60 litres (tank length at least 60 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 Cardinal Shrimp (Sulawesi) and German Blue Ram together?
Keep the aquarium between 27°C and 30°C. A target of around 28.5°C sits comfortably within both species' preferred ranges.
Are Cardinal Shrimp (Sulawesi) or German Blue Ram aggressive?
Cardinal Shrimp (Sulawesi) is peaceful (0/10) and German Blue Ram is generally mild-mannered (4/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Cardinal Shrimp (Sulawesi) and German Blue Ram need?
Their pH requirements do not overlap. Cardinal Shrimp (Sulawesi) prefers 7.5–8.5, while German Blue Ram needs 5–7. This makes them incompatible in the same water chemistry.
How do I manage German Blue Ram's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives German Blue Ram 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.
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 3, 2026
- Last updated
- May 3, 2026
- Issues or corrections?
- Contact the editorial team
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