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Nano Fish
- 13 Best Nano Fish
- Chili vs Phoenix Rasbora
Care
Breeding
Live Food
- Microworm Culture
- Daphnia Culture
Equipment
- Sponge Filters
- LED Plant Lights
Problems
- Why Nano Fish Lose Color
- Why Galaxy Rasboras Died

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Guides

Nano Fish11

Nano FishAll 11

Fish for 10 Gallon Tank: Stocking Plans for Nano Fish
Shrimp Safe Fish for Nano Tanks: 12 Species Rated by Risk
Emerald Dwarf Rasbora Care: Tank Size, Diet and Mates
Sparkling Gourami Care: Tank Size, Diet and Tank Mates
Clown Killifish Care: Tank Size, Diet and Tank Mates
Best Fish for a 5 Gallon Tank: 9 Picks With Exact Counts and Stocking Plans
Spotted Blue Eye Rainbowfish Care: Tank, Diet and Mates
Aquarium Fish Stock Calculator: How Many Fish Fit in Your Nano Tank
Best Fish for a 20 Gallon Aquarium: 24 Picks, Stocking Plans and What to Avoid
Chili Rasbora vs Phoenix Rasbora: How to Tell the Difference
Nano Fish: 15 Best Species for Small Tanks (Size Chart)

Care24

CareAll 24

Best Food for Nano Fish: How to Choose by Mouth, Species and Age
Nano Fish for an Unheated Tank: Species That Skip the Heater
Nano Fish Compatibility Chart: Who Can Live With Whom
Betta Tank Mates for a 5 or 10 Gallon: Nano Fish and Shrimp
Celestial Pearl Danio Tank Mates: Safe Fish and Shrimp
19 Ember Tetra Tank Mates: Best Fish, Shrimp & What to Skip
Harlequin Rasbora Care Guide: Tank Size, Mates, Breeding
Shrimp Safe Fish for Nano Tanks: 12 Species Rated by Risk
Emerald Dwarf Rasbora Care: Tank Size, Diet and Mates
Sparkling Gourami Care: Tank Size, Diet and Tank Mates
Clown Killifish Care: Tank Size, Diet and Tank Mates
Least Killifish (Heterandria formosa) Care Guide
Flame Moss Care Guide (Taxiphyllum sp. ‘Flame’)
Norman’s Lampeye Care: The Complete Guide
Spotted Blue Eye Rainbowfish Care: Tank, Diet and Mates
Scarlet Badis Care: Tank Size, Diet, Breeding and Shrimp Safety
Celestial Pearl Danio Care: Tank, Group, Food & Breeding
Pygmy Corydoras Care: Tank Size, Water, Food, Tank Mates & Breeding
Filterless Nano Aquarium: Rules, Limits & Failures
Kubotai Male vs Female: How to Tell Them Apart
Ember Tetra Care: Tank Size, Lifespan, Tank Mates & Problems
Medaka Ricefish (Japanese Ricefish): Expert Care Guide
Chili Rasbora Care: Tank Size, Food & Tank Mates
Kubotai Rasbora Expert Care: Size, Tank Mates, Diet & Breeding

Breeding11

BreedingAll 11

Medaka Eggs Not Hatching: Development, White Eggs and Common Problems
The Smallest Freshwater Fish in the World and the Tiniest Ones to Keep
Ember Tetra Eggs: What They Look Like & How to Hatch Them
Kubotai Rasbora Breeding: Setup, Eggs & Fry Guide
Pseudomugil Gertrudae Breeding: Spotted Blue-Eye Eggs, Fry & Tank Setup
How to Breed Pygmy Corydoras: Eggs, Temperature & Fry Care
Ember Tetra Breeding: Tank Setup, Spawning and Fry Care
Easy Nano Fish to Breed (Ranked) and How to Breed Them
Chili Rasbora Breeding: Tank Setup, Eggs and Fry Care
Celestial Pearl Danio Breeding: Galaxy Rasbora Eggs, Fry & Setup
Scarlet Badis Breeding: Eggs, Fry, Male vs Female & Tank Setup

Live Food2

Live FoodAll 2

Daphnia Culture at Home: Setup, Feeding & Troubleshooting
Microworm Culture for Fish Fry: How to Culture Microworms Step by Step

Equipment7

EquipmentAll 7

Best Air Pump for a Sponge Filter in a Nano Tank
Best Heater for a 5 Gallon Tank: What Wattage to Buy
Aquarium Algae Scraper Guide: Safe Picks for Glass and Acrylic Tanks (2026)
Aquarium Light Guide: PAR, Tank Size, Hours and the Best LEDs (2026)
Best Aquarium Heaters: Picks by Tank Size (2026)
Best Sponge Filters for Nano Tanks: Size & Setup Guide
Best Light for Planted Aquarium: 5 LED Options Compared

Problems3

ProblemsAll 3

Medaka Eggs Not Hatching: Development, White Eggs and Common Problems
Why Nano Fish Lose Color: Causes and Fixes
Why Your Galaxy Rasboras Died: 7 Real Causes (and How to Save the Rest)

Nano Fish

Species roundups and comparisons to help you choose the right nano fish for a small aquarium.

All 11 guides →

Fish for 10 Gallon Tank: Stocking Plans for Nano Fish
Shrimp Safe Fish for Nano Tanks: 12 Species Rated by Risk
Emerald Dwarf Rasbora Care: Tank Size, Diet and Mates
Sparkling Gourami Care: Tank Size, Diet and Tank Mates
Clown Killifish Care: Tank Size, Diet and Tank Mates
Best Fish for a 5 Gallon Tank: 9 Picks With Exact Counts and Stocking Plans
Spotted Blue Eye Rainbowfish Care: Tank, Diet and Mates
Aquarium Fish Stock Calculator: How Many Fish Fit in Your Nano Tank
Best Fish for a 20 Gallon Aquarium: 24 Picks, Stocking Plans and What to Avoid
Chili Rasbora vs Phoenix Rasbora: How to Tell the Difference
Nano Fish: 15 Best Species for Small Tanks (Size Chart)

Care

Species care guides for nano fish: tank size, water parameters, feeding, tank mates and common problems.

All 24 guides →

Best Food for Nano Fish: How to Choose by Mouth, Species and Age
Nano Fish for an Unheated Tank: Species That Skip the Heater
Nano Fish Compatibility Chart: Who Can Live With Whom
Betta Tank Mates for a 5 or 10 Gallon: Nano Fish and Shrimp
Celestial Pearl Danio Tank Mates: Safe Fish and Shrimp
19 Ember Tetra Tank Mates: Best Fish, Shrimp & What to Skip
Harlequin Rasbora Care Guide: Tank Size, Mates, Breeding
Shrimp Safe Fish for Nano Tanks: 12 Species Rated by Risk
Emerald Dwarf Rasbora Care: Tank Size, Diet and Mates
Sparkling Gourami Care: Tank Size, Diet and Tank Mates
Clown Killifish Care: Tank Size, Diet and Tank Mates
Least Killifish (Heterandria formosa) Care Guide

Breeding

Step-by-step breeding guides for nano fish, from conditioning and spawning to egg care and raising fry.

All 11 guides →

Medaka Eggs Not Hatching: Development, White Eggs and Common Problems
The Smallest Freshwater Fish in the World and the Tiniest Ones to Keep
Ember Tetra Eggs: What They Look Like & How to Hatch Them
Kubotai Rasbora Breeding: Setup, Eggs & Fry Guide
Pseudomugil Gertrudae Breeding: Spotted Blue-Eye Eggs, Fry & Tank Setup
How to Breed Pygmy Corydoras: Eggs, Temperature & Fry Care
Ember Tetra Breeding: Tank Setup, Spawning and Fry Care
Easy Nano Fish to Breed (Ranked) and How to Breed Them
Chili Rasbora Breeding: Tank Setup, Eggs and Fry Care
Celestial Pearl Danio Breeding: Galaxy Rasbora Eggs, Fry & Setup
Scarlet Badis Breeding: Eggs, Fry, Male vs Female & Tank Setup

Live Food

Live food culture guides for fry and small fish, including microworms and daphnia.

All 2 guides →

Daphnia Culture at Home: Setup, Feeding & Troubleshooting
Microworm Culture for Fish Fry: How to Culture Microworms Step by Step

Equipment

Filters, lights and gear that suit nano tanks, compared and explained.

All 7 guides →

Best Air Pump for a Sponge Filter in a Nano Tank
Best Heater for a 5 Gallon Tank: What Wattage to Buy
Aquarium Algae Scraper Guide: Safe Picks for Glass and Acrylic Tanks (2026)
Aquarium Light Guide: PAR, Tank Size, Hours and the Best LEDs (2026)
Best Aquarium Heaters: Picks by Tank Size (2026)
Best Sponge Filters for Nano Tanks: Size & Setup Guide
Best Light for Planted Aquarium: 5 LED Options Compared

Problems

Why nano fish lose color, hide or die, and what to check first.

All 3 guides →

Medaka Eggs Not Hatching: Development, White Eggs and Common Problems
Why Nano Fish Lose Color: Causes and Fixes
Why Your Galaxy Rasboras Died: 7 Real Causes (and How to Save the Rest)

Care and breeding guides for nano fish

Written by a hobbyist who has bred a few of them.

Featured: Best Food for Nano Fish: How to Choose by Mouth, Species and Age

Latest guides

CareBest Food for Nano Fish: How to Choose by Mouth, Species and Age

EquipmentBest Air Pump for a Sponge Filter in a Nano Tank

EquipmentBest Heater for a 5 Gallon Tank: What Wattage to Buy

CareNano Fish for an Unheated Tank: Species That Skip the Heater

Nano FishFish for 10 Gallon Tank: Stocking Plans for Nano Fish

CareNano Fish Compatibility Chart: Who Can Live With Whom

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