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Scarlet Badis
Dario dario
A tiny, brilliantly colored fish with males displaying vivid red and blue vertical stripes. One of the smallest freshwater fish, ideal for nano tanks but can be territorial.
Care Parameters
Adult size
2 cm
Min tank
20 L
Temperature
22–26°C
pH
6.5–7.5
GH
2–10 dGH
Diet
Carnivore
Temperament
Semi-aggressive
Water zone
Middle
Difficulty
Intermediate
Schooling
Pairs or small groups; males may spar.
Suitable Plants
5Ludwigia arcuata
A delicate stem plant with thin, needle-like leaves that turn deep red under high light. Also known as Needle Leaf Ludwigia, it adds fine texture and vibrant color to aquascapes.
Rotala sp. h'ra
A stunning stem plant that develops intense orange-red coloration under high light and CO2. Narrow leaves arranged in whorls create a striking background accent in aquascapes.
Sagittaria
A hardy rosette plant with broad, arrow-shaped leaves. Sends runners to form a grass-like carpet. Tolerates a wide range of conditions, suitable for beginners.
Dwarf Lettuce
A floating rosette plant resembling small lettuce heads. Provides shade, absorbs excess nutrients, and offers cover for fry. Roots provide habitat for microorganisms.
Rotala Macrandra
A stunning red stem plant that turns deep crimson-red under high light and CO₂. One of the most beautiful red aquarium plants. Requires soft, slightly acidic water.
Compatible Invertebrates
3Thai Micro Crab
A pea-sized, fully aquatic crab - no land zone needed - that perches on driftwood and picks microparticles from the water. Fragile and easily overlooked; keep a group of 3 or more in a mature nano tank, and never expose it to copper or sharp parameter swings.
Blue Crayfish
A selectively bred color morph of the red swamp crayfish with brilliant blue coloration. Hardy and active, but will eat plants and harass tank mates.
Vampire Crab
A small, semi-terrestrial crab with striking purple coloration and bright yellow eyes. Requires a paludarium setup with both land and water areas.
Suitable Equipment
5
Common Problems
5O
Old Tank Syndrome
Water quality slowly worsens over months or years despite regular small water changes.
waterF
Fin Rot
Fins look frayed, ragged or are visibly shrinking with white or red edges.
fishC
Cyanobacteria (Blue-Green Slime)
Slimy blue-green or dark purple patches with a foul odor.
waterT
Temperature Shock
Sudden temperature swings after water changes, heater failure or power cuts stress fish.
fishF
Fish Hiding or Chronic Stress
Fish hide constantly, refuse food and fade in color.
fish