Can Gertrude's Spotted Blue-eye and Reticulated Hillstream Loach Live Together?

🟢Ideal Tank Mates

Yes, Gertrude's Spotted Blue-eye and Reticulated Hillstream Loach are ideal tank mates. Both species share compatible water parameters and peaceful temperaments, making them well-suited for a community aquarium. They occupy different areas of the water column, which reduces competition for space. A minimum tank size of 96 litres is recommended.


At a Glance

Gertrude's Spotted Blue-eye

Pseudomugil gertrudae

Reticulated Hillstream Loach

Sewellia lineolata

🐠Family Group
Gertrude's Spotted Blue-eye
Rainbowfish
Reticulated Hillstream Loach
Loaches
Temperament
Gertrude's Spotted Blue-eye
Peaceful (2/10)
Reticulated Hillstream Loach
Mostly Peaceful (3/10)
Temperature
✓ Compatible
Gertrude's Spotted Blue-eye
21–28°C
Reticulated Hillstream Loach
20–24°C
pH Range
✓ Compatible
Gertrude's Spotted Blue-eye
6–7.5
Reticulated Hillstream Loach
6.5–7.5
Hardness (dGH)
✓ Compatible
Gertrude's Spotted Blue-eye
5–15
Reticulated Hillstream Loach
4–15
Water Type
✓ Compatible
Gertrude's Spotted Blue-eye
Freshwater Only
Reticulated Hillstream Loach
Freshwater Only
Flow Preference
✓ Compatible
Gertrude's Spotted Blue-eye
Moderate
Reticulated Hillstream Loach
High
Min Tank Volume
Combined: 96 L
Gertrude's Spotted Blue-eye
38 L
Reticulated Hillstream Loach
80 L
Swimming Level
✓ Different zones
Gertrude's Spotted Blue-eye
TopMiddle
Reticulated Hillstream Loach
Bottom
🏷️Behavior Tags
Gertrude's Spotted Blue-eye
Nano / Bite-sized (Predation Risk)Hyperactive / Fast SwimmerJumper (Lid Required)Fry Predator
Reticulated Hillstream Loach
Hyperactive / Fast SwimmerTerritorial (Defends specific area)

Behaviour & Temperament

Gertrude's Spotted Blue-eye is a peaceful species (2/10), while Reticulated Hillstream Loach is generally mild-mannered (3/10). This modest difference means Reticulated Hillstream Loach may occasionally assert dominance over Gertrude's Spotted Blue-eye.

In terms of spatial distribution, Gertrude's Spotted Blue-eye prefers the Top (Surface) and Middle (Open Water) zones, whereas Reticulated Hillstream Loach occupies the Bottom (Substrate) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

Worth noting: Gertrude's Spotted Blue-eye is a known jumper, so a tight-fitting lid is essential.

Water Parameters

The safe temperature window for both species falls between 21°C and 24°C. Aim for the midpoint of this range (around 22.5°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 Gertrude's Spotted Blue-eye and Reticulated Hillstream Loach together, plan for an aquarium of at least 96 litres with a minimum length of 90 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, Plants - Floating, Leaf Litter/Blackwater, Smooth Gravel (Sensitive Barbels), Established Algae (Otocinclus), Plants - lighly covered. 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 Gertrude's Spotted Blue-eye and Reticulated Hillstream Loach live together?

Yes. Gertrude's Spotted Blue-eye and Reticulated Hillstream Loach are considered ideal tank mates. Their water parameters, temperaments, and behaviour profiles are well matched for a community aquarium.

What size tank do Gertrude's Spotted Blue-eye and Reticulated Hillstream Loach need?

A minimum of 96 litres (tank length at least 90 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 Gertrude's Spotted Blue-eye and Reticulated Hillstream Loach together?

Keep the aquarium between 21°C and 24°C. A target of around 22.5°C sits comfortably within both species' preferred ranges.

Are Gertrude's Spotted Blue-eye or Reticulated Hillstream Loach aggressive?

Gertrude's Spotted Blue-eye is peaceful (2/10) and Reticulated Hillstream Loach is generally mild-mannered (3/10). Their similar temperaments generally lead to a peaceful coexistence.

What pH do Gertrude's Spotted Blue-eye and Reticulated Hillstream Loach 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 Reticulated Hillstream Loach's territorial behaviour?

Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Reticulated Hillstream Loach 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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