FinsHQ Encyclopedia

Fish & Livestock

Care guides for freshwater fish, marine species, and invertebrates — including water parameters, tank requirements, and where to buy.

6,005 species

intermediate

Nyererei Victorian Cichlid

Pundamilia nyererei

10 cm150 L2327°C
beginner

OB Peacock Aulonocara

Aulonocara sp.

14 cm200 L2428°C
intermediate

OB Peacock Cichlid

Aulonocara sp. 'OB'

15 cm200 L2427°C
beginner

OB Zebra Cichlid

Maylandia sp. (OB hybrid)

14 cm200 L2428°C
beginner

Oblique Kuhli Loach

Pangio oblonga

8 cm40 L2429°C
beginner

Oblique Penguin Tetra

Thayeria obliqua

6 cm80 L2228°C
intermediate

Oblique-lined Dottyback (Cypho purpurascens)

Cypho purpurascens

8 cm100 L2327°C
intermediate

Obscure Damselfish

Pomacentrus adelus

9 cm75 L2328°C
intermediate

Obscure Puffer

Pao obscurus

10 cm100 L2428°C
advanced

Obtuse Hillstream Loach

Liniparhomaloptera obtusirostris

8 cm80 L2024°C
intermediate

Obtusirostris Catfish

Calydontichthys obtusirostris

30 cm350 L2228°C
beginner

Ocellaris Clownfish

Amphiprion ocellaris

11 cm75 L2427°C
beginner

Ocellaris Clownfish Amphiprion ocellaris

Amphiprion ocellaris

9 cm100 L2427°C
advanced

Ocellate River Stingray

Potamotrygon ocellata

30 cm350 L2428°C
intermediate

Ocellated Betta (Betta ocellata)

Betta ocellata

13 cm150 L2026°C
intermediate

Ocellated Freshwater Puffer

Leiodon cutcutia

7 cm80 L2228°C
intermediate

Ocellated Gastromyzon

Gastromyzon ocellatus

5 cm70 L2226°C
advanced

Ocellated Hillstream Loach (Gastromyzon ocellatus)

Gastromyzon ocellatus

5 cm80 L2024°C
intermediate

Ocellated Nothobranch

Nothobranchius ocellatus

5 cm30 L2226°C
intermediate

Ocellated Puffer

Takifugu ocellatus

15 cm150 L2026°C
intermediate

Ocellated Spiny Eel

Macrognathus ocellatus

35 cm120 L1826°C
intermediate

Ocellated Synodontis

Synodontis ocellifer

30 cm300 L2227°C
beginner

Ocellifer Tetra

Hemigrammus ocellifer

4 cm60 L2228°C
intermediate

Octospawn Coral (Euphyllia yaeyamaensis)

Euphyllia yaeyamaensis

25 cm120 L2427°C
beginner

Odessa Barb

Pethia padamya

9 cm100 L2026°C
Odessa Barb (Pethia padamya)
EASY

Odessa Barb (Pethia padamya)

Pethia padamya

9 cm120 L2026°C
Easy

Odessa Barb Pethia padamya 8-Pack

Pethia padamya

7 cm80 L2026°C
beginner

Ogon Koi

Cyprinus rubrofuscus

90 cm1000 L525°C
intermediate

Oiapoque Cory

Corydoras oiapoquensis

4.5 cm60 L2327°C
intermediate

Ok Tedi Rainbowfish

Melanotaenia oktediensis

10 cm120 L2428°C
intermediate

Okefenokee Pygmy Sunfish

Elassoma okefenokee

3.5 cm30 L1024°C
intermediate

Okinawa Pygmy Goby (Trimma okinawae)

Trimma okinawae

3 cm30 L2428°C
beginner

Oktedi Rainbowfish

Melanotaenia oktediensis

10 cm150 L2328°C
beginner

Oligolepis Moenkhausia

Moenkhausia oligolepis

8 cm100 L2228°C
intermediate

Oligospila Pike Cichlid

Crenicichla oligospila

18 cm180 L2428°C
beginner

Olive Nerite Snail

Neritina reclivata

2 cm20 L2028°C
advanced

Oman Clownfish

Amphiprion omanensis

14 cm100 L2428°C
beginner

One-lined Pencilfish

Nannostomus unifasciatus

6.5 cm60 L2428°C
intermediate

One-spot Synodontis

Synodontis notatus

25 cm250 L2226°C
beginner

Opaline Gourami

Trichogaster trichopterus

15 cm80 L2228°C
intermediate

Ophthalmotilapia boops

Ophthalmotilapia boops

15 cm200 L2427°C
intermediate

Ophthalmotilapia heterodonta

Ophthalmotilapia heterodonta

17 cm300 L2427°C
intermediate

Ophthalmotilapia nasuta

Ophthalmotilapia nasuta

18 cm300 L2427°C
intermediate

Ophthalmotilapia ventralis

Ophthalmotilapia ventralis

16 cm200 L2427°C
intermediate

Opistognathus aurifrons 'Yellowhead Jawfish'

Opistognathus aurifrons

10 cm100 L2427°C
advanced

Opsaridium christyi

Opsaridium christyi

20 cm400 L2226°C
advanced

Opsaridium microlepis

Opsaridium microlepis

18 cm400 L2226°C
Advanced

Opsaridium tweddleorum

Opsaridium tweddleorum

20 cm200 L2026°C
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