Nano Fish Care Guides

This page brings together our listed small community fish and supporting bottom-dwellers and snails. Small size does not mean every species belongs in a tiny aquarium: schooling fish need groups, and bottom-dwellers need floor space.

General Care

Start with a mature, fully cycled aquarium, a fitted lid, shelter, and enough swimming and feeding room for each species. Keep ammonia and nitrite at zero and use regular water changes to control nitrate. Feed bottom-dwellers and snails directly instead of expecting them to survive on leftovers. Check that all tankmates share suitable temperature, hardness, and temperament.

Tank sizes below are planning recommendations for adult care. Aquarium footprint, group size, filtration, and individual behavior can require more space. Use stable conditions within the listed range; avoid sudden changes.

Species and Variety Guides

Harlequin Rasbora

  • Scientific name / group: Trigonostigma heteromorpha
  • Adult size: about 1.5–2 inches
  • Temperature: 74–80°F
  • pH: 6.0–7.5
  • Water hardness: soft to moderate
  • Aquarium: 20 gallons or larger for a school
  • Temperament: Peaceful schooling fish

Aquarium setup: Provide planted borders and open water; keep eight to ten or more.

Feeding: Fine flakes, micro-pellets, and tiny frozen or live foods.

Tank mates: Good with gentle small fish; avoid predators and boisterous fin-nippers.

Breeding: Eggs are often attached beneath broad plant leaves; a separate spawning setup protects eggs and fry.

Listed fish / animals: RASBORA – HET / HARLEQUIN live fish

Peacock Gudgeon

  • Scientific name / group: Tateurndina ocellicauda
  • Adult size: about 2.5–3 inches
  • Temperature: 72–79°F
  • pH: 6.5–7.5
  • Water hardness: soft to moderate
  • Aquarium: 20 gallons or larger for a small group
  • Temperament: Generally peaceful; males defend caves

Aquarium setup: Provide small caves, plants, gentle flow, and a tight lid.

Feeding: Small quality foods plus frozen brine shrimp, daphnia, and similar invertebrates; check that each fish eats.

Tank mates: Use calm small fish; avoid large predators and territorial bottom competitors.

Breeding: Cave spawner; the male guards eggs. A separate fry setup improves survival.

Listed fish / animals: Peacock Gudgeon

Panda Corydoras

  • Scientific name / group: Corydoras panda / Hoplisoma panda
  • Adult size: about 2 inches
  • Temperature: 72–77°F
  • pH: 6.0–7.4
  • Water hardness: soft to moderate
  • Aquarium: 20-gallon long or larger for six or more
  • Temperament: Peaceful shoaling catfish

Aquarium setup: Provide clean fine sand, shelter, and good oxygenation; leave surface access.

Feeding: Sinking omnivore pellets plus suitable small frozen foods.

Tank mates: Keep with gentle fish sharing its cooler conditions; avoid aggressive bottom fish.

Breeding: Egg layers; adults may eat eggs, so use a protected breeding and fry setup.

Listed fish / animals: Panda Corydoras

Green and Albino Bronze Corydoras

  • Scientific name / group: Corydoras aeneus / Osteogaster aenea
  • Adult size: about 2.5–3 inches
  • Temperature: 72–78°F
  • pH: 6.0–8.0
  • Water hardness: soft to moderate
  • Aquarium: 30 gallons or larger for a group; about 36 inches long
  • Temperament: Peaceful shoaling catfish

Aquarium setup: Keep at least six of the same species on clean sand with shelter and surface access.

Feeding: Sinking omnivore pellets and varied small frozen foods; do not rely on scraps.

Tank mates: Gentle community companions are suitable; avoid predatory or aggressive fish.

Breeding: Egg layers. Move eggs to a protected setup if raising fry; use a sponge-safe intake.

Listed fish / animals: Albino Corydoras · Green Corydoras (Corydoras aeneus)

Peppered Corydoras

  • Scientific name / group: Corydoras paleatus / Hoplisoma paleatum
  • Adult size: about 2.5–3 inches
  • Temperature: 68–77°F
  • pH: 6.4–7.6
  • Water hardness: soft to moderate
  • Aquarium: 20-gallon long or larger for six or more
  • Temperament: Peaceful shoaling catfish

Aquarium setup: Use clean fine sand, cover, and good oxygenation in a cooler community.

Feeding: Sinking omnivore pellets with suitable small frozen foods.

Tank mates: Avoid permanently hot tanks and aggressive bottom-dwellers.

Breeding: Egg layers; protect eggs from adults and feed tiny fry foods in a separate setup.

Listed fish / animals: Peppered Cory (Corydoras paleatus)

Albino Bristlenose Pleco

  • Scientific name / group: Ancistrus ornamental bristlenose strain
  • Adult size: about 4–5 inches
  • Temperature: 72–78°F
  • pH: 6.0–7.5
  • Water hardness: soft to moderate
  • Aquarium: 30 gallons or larger for one adult
  • Temperament: Generally peaceful; males can compete over caves

Aquarium setup: Provide wood, caves, good oxygenation, and effective filtration.

Feeding: Plant-rich sinking wafers, vegetables, and balanced supplementary foods; algae alone is insufficient.

Tank mates: Suitable with peaceful fish; provide more space and caves for multiple adults.

Breeding: Cave spawner; the male tends the eggs. Protect young and supply appropriate food.

Listed fish / animals: Albino Bristlenose Pleco Plecostomus

Mystery Snails

  • Scientific name / group: Pomacea mystery-snail trade group, commonly P. diffusa
  • Adult size: commonly about 2 inches; strain and species dependent
  • Temperature: 72–78°F
  • pH: 7.0–8.0
  • Water hardness: moderately hard; calcium-containing water
  • Aquarium: 10 gallons for a small lightly stocked setup; more space as numbers increase
  • Temperament: Peaceful

Aquarium setup: Use a lid, accessible surface air, and clean stable water; inspect shell growth.

Feeding: Sinking snail foods and suitable vegetables with calcium; remove uneaten food.

Tank mates: Avoid snail-eating fish, crayfish, and invertebrate-unsafe medications.

Breeding: Separate sexes reproduce by eggs laid above water. Keep clutches humid rather than submerged and plan grow-out space.

Listed fish / animals: Mystery Snails

Ramshorn Snails

  • Scientific name / group: Planorbidae — exact species depends on stock
  • Adult size: varies by species; many common aquarium forms stay around 1 inch
  • Temperature: 68–77°F
  • pH: 7.0–8.0
  • Water hardness: moderate; calcium-containing water
  • Aquarium: 10 gallons or larger for a managed colony
  • Temperament: Peaceful

Aquarium setup: Use a cycled aquarium with stable water and room for population growth.

Feeding: Appropriate sinking foods, biofilm, and vegetables; avoid overfeeding.

Tank mates: Gentle fish are suitable; avoid snail predators and copper treatments.

Breeding: Many ramshorns are hermaphrodites and lay submerged egg masses. Population growth tracks food supply, so monitor feeding and numbers.

Listed fish / animals: Rams Horn Snails

Related Care Guides

Species references and further reading

Ordering & Shipping

Orders must be placed by Sunday night to ship Monday. Check the individual product listing for available sizes, quantities, and shipping and live-arrival terms.

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