Can American Grass Shrimp and Red Swamp Crayfish Live Together?
American Grass Shrimp and Red Swamp Crayfish are not recommended as tank mates due to piscivorous fish will prey on nano-sized tank mates.. 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 American Grass Shrimp and Red Swamp Crayfish?
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.
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Behaviour & Temperament
American Grass Shrimp is a peaceful species (1/10), while Red Swamp Crayfish is highly aggressive (9/10). This notable difference means Red Swamp Crayfish may occasionally assert dominance over American Grass Shrimp.
Large aggression gap (8 points) between American Grass Shrimp and Red Swamp Crayfish increases stress risk for the more peaceful fish.
American Grass Shrimp and Red Swamp Crayfish 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.
There is a critical concern: the Nano / Bite-sized (Predation Risk) behaviour of one fish directly conflicts with the Piscivore (Eats small/nano fish) trait of the other — piscivorous fish will prey on nano-sized tank mates..
Additional behavioural considerations to keep in mind: Shrimp eaters may also prey on very small nano fish.
Worth noting: American Grass Shrimp is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 18°C and 28°C. Aim for the midpoint of this range (around 23.0°C) for optimal comfort.
Both fish can tolerate a pH between 6.5 and 8. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 8–15 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house American Grass Shrimp and Red Swamp Crayfish together, plan for an aquarium of at least 75 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: Plants - Densely covered, Leaf Litter/Blackwater, Driftwood (Digestion/Hiding), Shells (Breeding/Hiding). Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Red Swamp Crayfish is a plant destroyer, which conflicts with American Grass Shrimp's requirement for live plants. Compromise where possible or prioritise the more critical need.
Both species do well with moderate (standard) water movement, so a standard filtration setup rated for the tank volume should suffice.
Suitable Tank Sizes
Standard aquarium sizes large enough for both American Grass Shrimp and Red Swamp Crayfish.
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
36 Gallon Bowfront
40 Gallon Breeder
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Diet & Feeding
Feeding time deserves special attention with this pairing. Red Swamp Crayfish is a known shrimp eater and may prey on small invertebrates or nano fish like American Grass Shrimp.
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Frequently Asked Questions
Can American Grass Shrimp and Red Swamp Crayfish live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do American Grass Shrimp and Red Swamp Crayfish need?
A minimum of 75 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 American Grass Shrimp and Red Swamp Crayfish together?
Keep the aquarium between 18°C and 28°C. A target of around 23.0°C sits comfortably within both species' preferred ranges.
Are American Grass Shrimp or Red Swamp Crayfish aggressive?
American Grass Shrimp is peaceful (1/10) and Red Swamp Crayfish is highly aggressive (9/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do American Grass Shrimp and Red Swamp Crayfish need?
Both species overlap in the 6.5–8 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
How do I manage Red Swamp Crayfish's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Red Swamp Crayfish 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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