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Neon Dwarf Rainbowfish

The Dwarf Neon Rainbowfish (Melanotaenia praecoxis) is a popular smaller rainbowfish with blue iridescence sides.  The male’s fins are red/orange in color making the fish standout in any aquarium.  They come from New Guinea, Indonesia. These are captive raised. They are perfect community fish with other similar fish.

They grow to the adult size of less than 3 inches.  They make a perfect addition to a 20-gallon tank or larger with like sized calm fish.  They enjoy being around live plants, so those are a plus. It is encouraged that they be kept in groups of 8 to 10 so they feel comfortable in their aquarium. In a group of males and females, the males will have brighter colors as they display to the rest of the group.

Please Note: All fish shipments have a 100% Live Arrival Guarantee when shipping with Overnight (1 Day) option. All other options void our Live Arrival Guarantee for fish. 

To replicate their natural habitat, the use of rock work, plants, and driftwood should be included in the aquarium. They also enjoy tannins in their water, so the use of Indian Almond or Guava leaves is highly recommended. They enjoy having a shaded aquarium so keeping floating plants is encouraged to cut down the light reaching them. We would not recommend keeping this fish with shrimp colonies due to the likeliness of the dwarf neon rainbowfish eating baby shrimp and potentially picking at adult shrimp.

The scientific name for the dwarf neon rainbowfish is: Melanotaenia praecoxis

They are omnivores by nature. We feed our dwarf neon rainbowfish a mix of frozen foods including daphnia, baby brine, cyclops, and bloodworms.

Our Tank Parameters

  • Ph: 7.2 to 7.8
  • Gh: 6 to 12
  • Kh:  2 to 6
  • TDS: 120 to 200
  • Temp: 72 to 86

Tank Recommendations

  • Leaves: Indian Almond or Guava
  • Wood: Mopani or Malaysian
  • Cones: Alder Cones
  • Other: Buffered substrate to lower pH, not required

Customer Reviews

Based on 14 reviews
diana berberich
Aquatic gardner and hobbyest for 65 yrs

my dwarf rainbow are very healthy and lively and add a lovely hint of sparkling blue and turquoise as they chase thru the plants. I would order them again based on the specimens I received from you.

Shua Lor
First time buyer

I received 6 (bought 5) and they are all thriving well after a few weeks with color. I'm very pleased and would love to purchase these again in the future from flip aquatics.

Elisabeth Herbert

Neon Dwarf Rainbowfish

Thomas Fryar

Only I fish on whole order survived!very disappointed with the quality and size sent!

Hi Thomas!

We are so sorry to hear you had some losses! We hate to see this happen! Please email us at shipping@flipaquatics.com to submit a claim for your order so we can help you!


Deanna Ferguson
Happy happy fish

This was my third order from flip and it was another win. All seven (I ordered 6) arrived happy and healthy. Unpacking them is the best unboxing ever!