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Gertrude Blue Eye Rainbowfish (Pseudomugil gertrudae)

Gertrude Blue Eye Rainbowfish (Pseudomugil gertrudae)

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Pack Size: 1

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$6.00

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Description
Freshwater Fish

Spotted Blue-Eye

A translucent-bodied nano rainbowfish from Northern Australia and Papua New Guinea with vivid blue eyes and elaborately patterned fan-like fins edged in black and yellow. One of the most delicate and most beautiful fish in the freshwater hobby.

Translucent Body with Vivid Blue Eyes Spotted Fan-Like Fins Pseudomugil gertrudae pH 4.5–7.5 Group of 8 or More Excellent Shrimp Companion

Spotted Blue-Eye (Pseudomugil gertrudae), also known as the Spotted Blue-Eye or Gertrude's Rainbowfish, is a tiny, ethereally beautiful nano rainbowfish native to shallow, slow-moving streams, pools, and vegetated swamps in Northern Australia and Papua New Guinea. The body is translucent to pale silver-white with subtle warm tints, giving the fish an almost luminous quality, and the eyes are a vivid, clearly visible blue. The fins -- particularly the dorsal and anal fins of adult males -- are elaborately developed into broad, spotted fan-like structures edged in black and yellow that the males spread and display continuously when competing for female attention. This constant displaying behaviour, combined with the fish's small size and delicate colouration, makes a well-kept group of Spotted Blue-Eyes one of the most visually engaging nano tank inhabitants available. They require a mature, densely planted tank, a group of 8 or more, and small food. One of the most shrimp-compatible fish in the hobby due to their tiny mouth size.

4.5–7.5pH
1–10GH (dGH)
72–82°FTemperature
1.2 inMax Size

Fan Fins, Blue Eyes & Constant Displaying

Translucent body with vivid blue eyes -- the colouration is subtle but striking at close range. The body of P. gertrudae is pale and translucent, allowing internal structures to be faintly visible through the body wall. Subtle silver, turquoise, and yellow tints are present, particularly in males, and the iridescence shifts as the fish moves through different light angles. The blue eyes are the most immediately striking colour element and are clearly visible from across the tank. Elaborately patterned fan-like fins on adult males -- spread continuously during display. Male Spotted Blue-Eyes develop distinctly enlarged dorsal and anal fins patterned with spots and edged in black and yellow. These fins are spread and held erect continuously as males display to rivals and potential mates, creating a constant visual spectacle of fin-fanning and colour-intensifying behaviour that smaller-finned fish cannot replicate. The displaying is not aggressive -- it is performative and fascinating to observe. Keep in groups of 8 or more -- timid and pale in small numbers. In groups below 6 Spotted Blue-Eyes are shy, hide frequently, and show faded colour. In a group of 8 or more they emerge confidently, display continuously, and show their full colouration. A school of 10 to 15 in a well-planted blackwater setup is the minimum for the full display behaviour the species is known for. Requires a biologically mature, densely planted tank -- sensitive to water quality fluctuations. This species is not suitable for a new or cycling aquarium. It requires stable, established water chemistry and will decline quickly in response to ammonia spikes, nitrite, or significant pH shifts. A tank running for at least 3 months before introduction is recommended. Dense fine-leaved planting, floating plants to diffuse light, and driftwood to add tannins create the ideal environment.

Among the Most Shrimp-Safe Fish Available

Tiny mouth -- adult Neocaridina and Caridina shrimp are completely safe. The mouths of Spotted Blue-Eyes are so small that adult shrimp of any size are entirely beyond what the fish can consume. Only the very smallest newly hatched shrimplets in their first few days of life are at any risk. In a planted tank with moss and fine-leaved plants, shrimplet survival alongside Spotted Blue-Eyes is very high. This makes them one of the most genuinely shrimp-safe fish available. Parameter overlap with both Neocaridina and Caridina is excellent. P. gertrudae tolerates pH 4.5 to 7.5 and soft to moderately soft water, spanning both the Neocaridina and Caridina parameter ranges. The fish performs well in tannin-stained water, aligning particularly naturally with a Caridina blackwater setup. Avoid mixing with other Pseudomugil species in breeding tanks as hybridisation is possible.
Keeper's Note

A group of 12 Spotted Blue-Eyes in a 15-gallon blackwater planted tank with Almond Leaves, Java Moss, fine dark substrate, and a colony of Crystal Red or Neocaridina shrimp is one of the most elegant and most visually sophisticated nano tank setups achievable in the freshwater hobby. The constant displaying of the male fins, the translucent bodies catching light, and the shrimp moving below create a living display that rewards close observation indefinitely. Feed small foods twice daily and maintain stable water quality -- this species repays careful husbandry with outstanding long-term colour and behaviour.

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Policies & Disclaimers
Before you order · Fish

Policies & Disclaimers

What to expect from your fish, overnight shipping requirements, and what to do when your order arrives.

Overnight shipping required for guarantee coverage

Choose overnight (next day air) shipping for fish. Our Live Arrival Guarantee does not cover fish shipped by 2-day, standard expedited or ground service. Overnight shipping is a condition of coverage; the claim deadline and documentation requirements below also apply.

Size & representative photos

Fish size and appearance vary by species, age and individual. Refer to the listing and selected option for any stated purchase size. Adult or maximum sizes in care information describe growth potential, not a guaranteed size on arrival. Photos represent the species or variety rather than the exact fish you will receive.

Color & settling in

Color and markings can vary between individuals and with age, sex, lighting and aquarium conditions. Fish may look paler after shipping. Follow the species-specific acclimation and care guidance and provide stable water conditions. If a fish arrives dead or visibly distressed, document its condition and contact us promptly rather than waiting beyond the claim window.

Species needs & compatibility

Check the specific listing for adult size, temperature, water requirements, diet and recommended group size. A small shipping size does not mean a fish will stay small. Choose suitable tankmates and allow for adult growth; a community-fish label is not a guarantee of compatibility with every fish or invertebrate.

Pack contents & selection

The selected quantity identifies the number of fish ordered. A group does not by itself promise a breeding pair or particular sex ratio. Any explicit sex or selection offered in the listing applies to that selected option.

Juvenile appearance, growth & sex differences

Young fish may have less intense coloration, different proportions or less-developed fins than mature examples in photographs. Species, age, sex and social conditions can affect their appearance. Adult-size figures describe growth potential, not the size guaranteed in the shipping bag.

Plan housing around adult needs. A small pleco, for example, still needs the space and diet appropriate to its identified species as it grows. Use the listing’s stated species and selected option rather than a photograph alone to judge what you are buying.

Unless a listing explicitly offers a sex-selected option, a quantity pack is not a specified sex ratio or breeding pair. Where an explicit selection is offered, that selected option applies.

Shipping appearance versus concerning distress

Paler colors, hiding and a reduced initial appetite can occur after transport. These observations alone do not establish a covered loss. They also should not be used to dismiss a fish that appears to be struggling.

Photograph or record visible concerns such as loss of balance, persistent labored breathing, an obvious wound or a fish that appears dead while it is still in the original packaging. Include the label and packaging and contact us promptly within the two-hour reporting window. Report observations rather than guessing a diagnosis.

Do not wait for color or activity to improve before reporting an arrival concern. Coverage and resolution follow the full guarantee; this guidance does not add a new health guarantee or extend the claim window.

Schools, tankmates & adult housing

Schooling fish should be housed with an appropriate group of their own species. The quantity options offered for purchase are not a statement that each option is a suitable permanent school size. Check the listing’s group-size guidance and the aquarium’s capacity.

Peaceful fish can still eat animals small enough to fit in their mouths, including shrimplets. Consider adult size, feeding behavior, water requirements and available shelter when choosing tankmates. No general community label guarantees compatibility in every aquarium.

Bottom-dwelling fish need food that reaches them; they should not be expected to live only on leftovers. Provide the species-appropriate diet and observe whether quieter fish are being outcompeted.

Acclimation & quarantine

Have a stable, cycled aquarium or suitable quarantine setup ready before the shipment arrives. Follow the acclimation instructions appropriate to shipped fish and the species; do not assume a single timed method is suitable for every shipment or bag condition.

Document arrival concerns before transfer under the guarantee’s instructions. Avoid adding shipping water to the established aquarium, and minimize unnecessary handling and disturbance during introduction.

Separate observation of new fish can help protect an established collection and make feeding and behavior easier to monitor. Quarantine is care advice here, not a newly added condition of claim eligibility. Do not medicate automatically without considering the species and the actual concern.

Bonus animals & your paid count

When inventory allows, our policy provides one bonus animal for every five ordered of the same species. Bonuses are discretionary and are not separately covered for refund or replacement. They count toward the total arriving alive when assessing whether your paid quantity was fulfilled.

For example, if you order 10 fish and receive 12, receiving 11 alive fulfills the paid count. If fewer than 10 arrive alive, the shortfall is assessed under the guarantee. Expected bonuses that were not included are not a paid-item shortage.

Checking quantities & reporting a short count

Check the actual animals received against your paid order quantity. For a suspected short count, the full policy calls for a clear counting photo showing all animals, the empty bag and the shipping label before they are introduced into an aquarium. Follow its counting instructions and contact us if you cannot document the count clearly.

Verified miscount claims are resolved with a refund for the missing paid animals under the current policy. A count made after release can be unreliable when animals hide among plants or hardscape.

Before opening: photographs & your first report

Use the email address on the original order and include all arrival concerns in the initial message to support@superiorshrimpaquatics.com within two hours of the carrier’s recorded delivery time. Photograph the sealed bag, visible and countable animals, shipping label, box and packing materials.

If the bag is leaking or damaged, photograph the leak or damage and wet packing before opening. Keep the original photographs and packaging. For cloudy water that prevents counting, take the original cloudy-water photo first and follow the full policy’s specific additional clear-container documentation instructions.

The guarantee contains restrictions on opening bags, acclimation and transfers. Review those instructions before taking action so the evidence needed to assess the claim is preserved.

Arrival problem? Document it promptly.

Email support@superiorshrimpaquatics.com within two hours of the carrier’s recorded delivery time, using the email address on your order.

  • Photograph the original sealed bag with the animals visible and countable.
  • Include the shipping label, outer box and packing materials.
  • Document any bag damage or leakage before opening.
  • Report all arrival losses in your initial message.

Read the full guarantee for photo requirements, cloudy-water documentation and claim eligibility before opening or transferring animals. Approved claims are resolved under the options and conditions stated there.

Shipping & coverage limits

Fish must ship by overnight (next day air) service to qualify for the Live Arrival Guarantee. Fish shipped by 2-day, standard expedited or ground service are not covered. Selecting a non-overnight method waives guarantee coverage for the fish in that order.

The guarantee applies to the first delivery attempt. Redirection, pickup holds and carrier delays can affect eligibility under the full policy. Any product-specific coverage restrictions stated in a listing also apply.

Hitchhikers & quarantine

Live aquatic products can carry tiny hitchhikers or eggs despite inspection. Pest-free arrival is not guaranteed. We recommend quarantining new arrivals before introducing them into an established aquarium.

Returns

Care guidance in this tab does not create additional guarantee requirements or exclusions. Please read the full policies for complete eligibility, documentation, resolution and return requirements.

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