Pseudomugil Gertrudae ‘Aru IV’ Rainbowfish
Pseudomugil Gertrudae ‘Aru IV’ Rainbowfish
These are my homebred Pseudomugil Gertrudae Rainbowfish!
In an effort to keep fish shipping as safe as possible, I am not currently listing fish for sale directly on the website. If you’re in an area with nighttime lows consistently above 50°F, email your zip code and which fish you want to info@dakuaquatics.com and I will check weather, shipping, and get back to you within 24 hours!
FYI - I only ship fish overnight via UPS Next Day Air.
The Pseudomugil gertrudae ‘Aru IV’ is a stunning and highly sought-after variety of Spotted Blue Eye, known for its delicate, translucent body and beautifully patterned fins covered in bold black spots. Originating from the Aru Islands, this strain is prized for its intricate finnage and constant, fluttering movement in the water column. Males display especially vibrant fins and will actively show off to each other, creating a mesmerizing display in well-planted aquariums. Peaceful and active, they are an excellent choice for nano and community tanks.
Key Features
Key Features
- Elegant fins with distinct black spot patterned body
- Bright blue eyes that shimmer under aquarium lighting
- Active, mid-to-top level swimmers that add movement to tanks
- Peaceful and compatible with community fish
- Males display beautiful fin extensions and social behavior
Care Tips
Care Tips
- Tank Size: Minimum 10 gallons for a group
- Water Parameters: pH 6.0–7.5, Temperature 74–82°F (23–28°C)
- Diet: Omnivorous; thrives on micro pellets, flakes, and live/frozen foods like baby brine shrimp and daphnia
- Behavior: Peaceful and social; best kept in groups of 5 or more
- Breeding: Egg layers; prefer plants or spawning mops for egg-laying
Live Arrival Guarantee
Live Arrival Guarantee
In the event of a DOA, we will replace the affected plants or livestock and reship FOR FREE!
If a DOA has occurred, please send clear photos of the affected plants or livestock in their closed shipping containers to info@dakuaquatics.com within 2 hours of the first delivery attempt and we will make it right!
If your low temps are below freezing, select UPS 2 Day Air at check out so we can include a free heat pack and get your plants to you fast and warm!

With their intricate patterns, flowing fins, and constant activity, the Pseudomugil gertrudae ‘Aru IV’ brings both elegance and energy to any planted aquarium, making them a standout species for aquascapers and nano fish enthusiasts alike.