Can Florida Flagfish and Reedfish (Ropefish) Live Together?

🟢Ideal Tank Mates

Yes, Florida Flagfish and Reedfish (Ropefish) 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 216 litres is recommended.


At a Glance

Florida Flagfish

Jordanella floridae

Reedfish (Ropefish)

Erpetoichthys calabaricus

🐠Family Group
Florida Flagfish
Killifish
Reedfish (Ropefish)
Oddballs
Temperament
Florida Flagfish
Semi-Aggressive (5/10)
Reedfish (Ropefish)
Mostly Peaceful (3/10)
Temperature
✓ Compatible
Florida Flagfish
18–26°C
Reedfish (Ropefish)
22–28°C
pH Range
✓ Compatible
Florida Flagfish
6.5–8.5
Reedfish (Ropefish)
6–7.5
Hardness (dGH)
✓ Compatible
Florida Flagfish
10–25
Reedfish (Ropefish)
5–20
Water Type
✓ Compatible
Florida Flagfish
Brackish Tolerant
Reedfish (Ropefish)
Freshwater Only
Flow Preference
✓ Compatible
Florida Flagfish
Low
Reedfish (Ropefish)
Low
Min Tank Volume
Combined: 216 L
Florida Flagfish
75 L
Reedfish (Ropefish)
180 L
Swimming Level
Shared: 2 zones
Florida Flagfish
MiddleBottom
Reedfish (Ropefish)
BottomMiddle
🏷️Behavior Tags
Florida Flagfish
Fin NipperAggressive to same species/look-alikesHyperactive / Fast SwimmerTerritorial (Defends specific area)
Reedfish (Ropefish)
Piscivore (Eats small/nano fish)Shrimp EaterJumper (Lid Required)NocturnalHyperactive / Fast SwimmerSlime Coat Eater (Attacks Flat Fish)

Behaviour & Temperament

Florida Flagfish is a moderately assertive species (5/10), while Reedfish (Ropefish) is generally mild-mannered (3/10). This modest difference means Florida Flagfish may occasionally assert dominance over Reedfish (Ropefish).

Florida Flagfish and Reedfish (Ropefish) both frequent the Middle (Open Water) and 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: Reedfish (Ropefish) is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Reedfish (Ropefish) is a known jumper, so a tight-fitting lid is essential.

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 10–20 dGH. Regular testing will ensure conditions stay within this range.

Tank Setup

To house Florida Flagfish and Reedfish (Ropefish) together, plan for an aquarium of at least 216 litres with a minimum length of 120 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: Established Algae (Otocinclus), Plants - Densely covered, Sand (Sifters), Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding). 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.

Frequently Asked Questions

Can Florida Flagfish and Reedfish (Ropefish) live together?

Yes. Florida Flagfish and Reedfish (Ropefish) are considered ideal tank mates. Their water parameters, temperaments, and behaviour profiles are well matched for a community aquarium.

What size tank do Florida Flagfish and Reedfish (Ropefish) need?

A minimum of 216 litres (tank length at least 120 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 Florida Flagfish and Reedfish (Ropefish) 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 Florida Flagfish or Reedfish (Ropefish) aggressive?

Florida Flagfish is moderately assertive (5/10) and Reedfish (Ropefish) is generally mild-mannered (3/10). Their similar temperaments generally lead to a peaceful coexistence.

What pH do Florida Flagfish and Reedfish (Ropefish) 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.

Will Florida Flagfish nip Reedfish (Ropefish)'s fins?

Florida Flagfish is a known fin nipper. If Reedfish (Ropefish) has long or flowing fins, there is a real risk of fin damage. Keeping Florida Flagfish in a larger group can help redirect nipping behaviour toward conspecifics.

How do I manage Florida Flagfish's territorial behaviour?

Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Florida Flagfish 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 Reedfish (Ropefish) being nocturnal affect compatibility?

Reedfish (Ropefish) 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 Reedfish (Ropefish) during evening hours.


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