Beginner freshwater fish: O

All beginner freshwater fish whose common name starts with O, in alphabetical order. Each card links to its care guide.

6 species

Odessa barb
Pethia padamya
Freshwater
1.8 in (4.5 cm) · 20 gal (75 L)61–77°F (16–25°C)
Onespot barb
Puntius terio
Freshwater
3.1 in (8 cm) · 20 gal (75 L)68–79°F (20–26°C)
Orange hatchet danio
Laubuka dadiburjori
Freshwater
1.2 in (3 cm) · 13 gal (50 L)68–75°F (20–24°C)
Orange-finned danio
Danio kyathit
Freshwater
2 in (5 cm) · 20 gal (75 L)68–79°F (20–26°C)
Ornate shell dweller
Lamprologus ornatipinnis
Freshwater
2.4 in (6 cm) · 16 gal (60 L)75–81°F (24–27°C)
Ornate tetra
Hyphessobrycon bentosi
Freshwater
1.8 in (4.5 cm) · 20 gal (75 L)72–82°F (22–28°C)

Planning a tank?

TankBud checks stocking and water fit as you build a tank, then tracks water tests, reminders and photos once it is running.

Maintain tanks for clients? See TankBud Pro