Can Masked Julie (Julidochromis) and Tire Track Eel Live Together?

🔴Not Recommended

Masked Julie (Julidochromis) and Tire Track Eel 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

Masked Julie (Julidochromis)

Julidochromis transcriptus

Tire Track Eel

Mastacembelus armatus

🐠Family Group
Masked Julie (Julidochromis)
Cichlids - African
Tire Track Eel
Oddballs
Temperament
Masked Julie (Julidochromis)
Semi-Aggressive (6/10)
Tire Track Eel
Semi-Aggressive (6/10)
Temperature
✓ Compatible
Masked Julie (Julidochromis)
23–27°C
Tire Track Eel
22–28°C
pH Range
✗ No overlap
Masked Julie (Julidochromis)
8–9
Tire Track Eel
6.5–7.5
Hardness (dGH)
✓ Compatible
Masked Julie (Julidochromis)
10–20
Tire Track Eel
5–15
Water Type
✓ Compatible
Masked Julie (Julidochromis)
Freshwater Only
Tire Track Eel
Freshwater Only
Flow Preference
✓ Compatible
Masked Julie (Julidochromis)
Moderate
Tire Track Eel
Moderate
Min Tank Volume
Combined: 816 L
Masked Julie (Julidochromis)
60 L
Tire Track Eel
680 L
Swimming Level
Shared: 1 zone
Masked Julie (Julidochromis)
BottomMiddle
Tire Track Eel
Bottom
🏷️Behavior Tags
Masked Julie (Julidochromis)
Territorial (Defends specific area)Aggressive to same species/look-alikesFry PredatorShy / Slow Moving (Easily Stressed)
Tire Track Eel
Piscivore (Eats small/nano fish)Shrimp EaterDigger (Disturbs Substrate)Jumper (Lid Required)NocturnalAggressive to same species/look-alikes

Behaviour & Temperament

Both Masked Julie (Julidochromis) and Tire Track Eel are moderately assertive species with an aggression score of 6/10. Their matching temperaments mean neither fish is likely to dominate the other in a shared aquarium.

Masked Julie (Julidochromis) and Tire Track Eel 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: Tire Track Eel is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Tire Track Eel is a known jumper, so a tight-fitting lid is essential.

Water Parameters

The safe temperature window for both species falls between 23°C and 27°C. Aim for the midpoint of this range (around 25.0°C) for optimal comfort.

The pH requirements of Masked Julie (Julidochromis) (8–9) and Tire Track Eel (6.5–7.5) do not overlap, making it impossible to satisfy both species simultaneously.

For general hardness, the shared comfort zone is 10–15 dGH. Regular testing will ensure conditions stay within this range. An aquarium test kit is recommended for monitoring.

Tank Setup

To house Masked Julie (Julidochromis) and Tire Track Eel together, plan for an aquarium of at least 816 litres with a minimum length of 180 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: Sand (Sifters), Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding). Meeting these requirements will help both species thrive.

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

Find the right tank equipment

Browse tanks, décor, and equipment suited for this setup.

Frequently Asked Questions

Can Masked Julie (Julidochromis) and Tire Track Eel live together?

No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.

What size tank do Masked Julie (Julidochromis) and Tire Track Eel need?

A minimum of 816 litres (tank length at least 180 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 Masked Julie (Julidochromis) and Tire Track Eel together?

Keep the aquarium between 23°C and 27°C. A target of around 25.0°C sits comfortably within both species' preferred ranges.

Are Masked Julie (Julidochromis) or Tire Track Eel aggressive?

Masked Julie (Julidochromis) is moderately assertive (6/10) and Tire Track Eel is moderately assertive (6/10). Their similar temperaments generally lead to a peaceful coexistence.

What pH do Masked Julie (Julidochromis) and Tire Track Eel need?

Their pH requirements do not overlap. Masked Julie (Julidochromis) prefers 8–9, while Tire Track Eel needs 6.5–7.5. This makes them incompatible in the same water chemistry.

How do I manage Masked Julie (Julidochromis)'s territorial behaviour?

Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Masked Julie (Julidochromis) 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 Tire Track Eel being nocturnal affect compatibility?

Tire Track Eel 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 Tire Track Eel during evening hours.


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