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Care parameters and compatibility for freshwater and marine fish.
Pterophyllum scalare
Graceful, tall-bodied cichlid. Semi-aggressive when breeding; pairs may defend territory.
Pterapogon kauderni
Care profile for Banggai Cardinalfish (Pterapogon kauderni): 8 cm adult size, 24–28°C, pH 8–8.4, intermediate difficulty.
Hyphessobrycon herbertaxelrodi
A calm, hardy tetra with a bold neon stripe contrasting a dark body. Ideal for peaceful community tanks.
Hyphessobrycon megalopterus
A graceful dark tetra with elegant fins; males flare their dorsal in display. Hardy and perfect for peaceful planted tanks.
Gymnocorymbus ternetzi
Hardy tetra with a distinctive black body and flowing fins. Peaceful but may nip fins of slow tankmates.
Andinoacara pulcher
A striking blue-scaled cichlid that is relatively peaceful for its size, though territorial when breeding. An avid digger, so anchor plants well.
Melanotaenia boesemani
Known for a striking blue-to-orange gradient body. Needs a roomy tank and a group to look its best.
Mikrogeophagus altispinosus
A hardy, peaceful dwarf cichlid that sifts sand for food. More tolerant of cooler water and varied chemistry than the Blue Ram.
Ancistrus cf. cirrhosus
A manageable pleco (up to 13 cm) that eats algae and fits most community tanks. Males grow bristly tentacles.
Corydoras aeneus
One of the hardiest and most popular catfish for community tanks. Forages the substrate in groups; sand is the ideal substrate.
Paracheirodon axelrodi
Brighter and larger than the neon tetra. Prefers soft, slightly acidic blackwater conditions.
Danio margaritatus
A tiny, stunning fish covered in galaxy-like spots. Shy and needs a planted, dimly lit tank.
Puntius titteya
A shy, peaceful barb that shows intense red color when happy. Great for planted aquariums.
Boraras brigittae
Care profile for Chili Rasbora (Boraras brigittae): 2 cm adult size, 23–27°C, pH 4–7, intermediate difficulty.
Chromobotia macracanthus
Playful, social loach with striking orange-black stripes. Grows to 30 cm and needs a very large group.
Panaqolus maccus
Care profile for Clown Pleco (Panaqolus maccus): 10 cm adult size, 24–28°C, pH 6.5–7.5, beginner difficulty.
Apistogramma cacatuoides
A colorful dwarf cichlid that forms harem groups. Territorial when breeding; best in a species or biotope tank.
Hypostomus plecostomus
Grows much larger than most expect (30+ cm). Needs a very large tank; consider a dwarf species for smaller setups.
Phenacogrammus interruptus
A large, shimmering tetra with rainbow reflections on mature males. Needs a spacious tank and a shoal to display its best colors.
Symphysodon aequifasciatus
The king of the aquarium — demanding stable warm water and high-quality food. Very rewarding for experienced keepers.
Tropheus duboisi
Care profile for Dubois’ Tropheus (Tropheus duboisi): 12 cm adult size, 24–28°C, pH 7.8–8.6, expert difficulty.
Trichogaster lalius
A small labyrinth fish with beautiful red-blue stripes. Hardy but prone to stress in poor water conditions.
Melanotaenia praecox
A vivid blue-and-red rainbowfish that stays small. Active open-water swimmer — needs a longer tank and a shoal of at least 8.
Labidochromis caeruleus
The famous yellow 'Yellow Lab' from Lake Malawi. One of the most peaceful mbuna; keep one male with several females.
Hyphessobrycon amandae
A tiny, glowing orange tetra that adds brilliant color to nano and planted tanks. Peaceful and hardy, best kept in a group of 8 or more.
Betta smaragdina
Care profile for Emerald Betta (Betta smaragdina): 7 cm adult size, 24–28°C, pH 6–7.5, beginner difficulty.
Celestichthys erythromicron
Not a true rasbora but a small danio from the cool, alkaline waters of Lake Inle. Unusual for a nano fish: it needs neutral-to-alkaline water.
Nematobrycon palmeri
A striking tetra with an extended, three-pronged tail in males. Males establish mild territories, so a roomy, planted tank suits them best.
Poecilia wingei
A tiny, dazzling livebearer closely related to the guppy. Avoid keeping it with guppies, as the two species hybridize freely.
Carassius auratus
Coldwater classic. Fancy varieties need more space and better filtration than common goldfish — 150 L+ for a single adult.
Thorichthys meeki
Named for the fiery red throat it flares during display. Robust and adaptable, but an avid digger — use sand and anchored decor.
Centropyge loricula
Care profile for Flame Angelfish (Centropyge loricula): 12 cm adult size, 24–27°C, pH 8.1–8.4, intermediate difficulty.
Mikrogeophagus ramirezi
Care profile for German Blue Ram (Mikrogeophagus ramirezi): 6 cm adult size, 26–29°C, pH 5.5–7, intermediate difficulty.
Kryptopterus vitreolus
A truly transparent catfish that is shy unless kept in a group of 6 or more. Needs gentle flow and a dimly lit, mature tank.
Nannostomus beckfordi
Care profile for Golden Pencilfish (Nannostomus beckfordi): 6 cm adult size, 24–28°C, pH 5.5–7.5, intermediate difficulty.
Aplocheilus lineatus
A surface-hunting killifish with golden flanks and red fins. Not annual, quite hardy, but will eat any fish small enough to fit its mouth.
Chromis viridis
A peaceful, schooling damselfish that adds shimmering movement to a reef tank.
Poecilia reticulata
Colorful, active livebearer that is extremely easy to breed. Tolerates a wide range of water conditions.
Trigonostigma heteromorpha
A peaceful, hardy schooling fish with a distinctive black triangle marking. Ideal for planted community tanks.
Trichogaster chuna
Care profile for Honey Gourami (Trichogaster chuna): 5 cm adult size, 24–28°C, pH 6–7.5, beginner difficulty.
Pelvicachromis pulcher
A beautiful West African dwarf cichlid and one of the best beginner cichlids. Provide caves; pairs become territorial when breeding.
Microdevario kubotai
Care profile for Kubotai Rasbora (Microdevario kubotai): 2.2 cm adult size, 22–27°C, pH 6.5–7.5, beginner difficulty.
Pangio kuhlii
Eel-like, nocturnal loach that loves hiding among plants and driftwood. Peaceful scavenger.
Trigonostigma espei
A small, peaceful rasbora with a copper-orange body and a lambchop-shaped black patch. Perfect for nano planted tanks.
Hyphessobrycon pulchripinnis
A gentle, schooling tetra with translucent yellow fins and lemon-tinted body. Great for planted community aquariums.
Pseudanthias squamipinnis
A reef planktivore that needs frequent small feedings. Groups with one dominant male.
Aphyosemion australe
A stunning killifish with lyre-shaped fins. Best kept in a small, heavily planted tank.
Paracheirodon innesi
A classic schooling tetra with a bright blue-red stripe. Hardy, peaceful and ideal for community tanks.
Amphiprion ocellaris
The classic orange clownfish made famous by animation. Hardy and reef-safe, can host anemones.
Pethia padamya
A small, strikingly striped barb with a red-gold blaze. Peaceful and ideal for planted community aquariums.
Otocinclus affinis
Small algae-eating catfish that is the perfect cleanup crew for planted tanks. Needs established algae or supplemental food.
Corydoras panda
A beloved black-and-white Cory that prefers cooler water than most tropical fish. Peaceful and perfect for planted tanks.
Trichopodus leerii
A peaceful labyrinth fish dusted with pearl-like spots. Adaptable to varied water, but enjoys floating plants and gentle filtration.
Corydoras paleatus
A charming armored catfish that scavenges the substrate. Peaceful and social, great for community tanks.
Amphiprion percula
Care profile for Percula Clownfish (Amphiprion percula): 8 cm adult size, 24–28°C, pH 8–8.4, beginner difficulty.
Corydoras pygmaeus
Care profile for Pygmy Corydoras (Corydoras pygmaeus): 2.5 cm adult size, 22–26°C, pH 5.5–7.5, beginner difficulty.
Garra rufa
Care profile for Red Garra (Garra rufa): 12 cm adult size, 20–27°C, pH 6.5–8, beginner difficulty.
Pethia conchonius
A hardy, active barb that tolerates cooler water and is even kept as a pond fish in mild climates. Best in schools of 5 or more.
Hemigrammus rhodostomus
Care profile for Rummynose Tetra (Hemigrammus rhodostomus): 5 cm adult size, 24–28°C, pH 5.5–7.5, intermediate difficulty.
Hyphessobrycon eques
A vivid red tetra that may nip fins unless kept in a large group of at least 12. Very active and hardy once settled.
Poecilia sphenops
A versatile livebearer that tolerates hard, even brackish water. Males reach 8 cm while females can grow to 12 cm.
Betta splendens
One of the most popular aquarium fish, known for flowing fins and labyrinth breathing. Best kept alone or with peaceful tankmates.
Gasteropelecus sternicla
Care profile for Silver Hatchetfish (Gasteropelecus sternicla): 6.5 cm adult size, 24–28°C, pH 6–7.5, intermediate difficulty.
Xiphophorus maculatus
A friendly, colorful livebearer that adapts to almost any community tank. Extremely easy to keep and breed.
Trichopsis pumila
A tiny croaking gourami that fits nano planted tanks. Excellent jumper — a tight lid and floating plants are essential.
Xiphophorus hellerii
Active livebearer named after the male's long sword-like tail. Very easy to keep and breed.
Corydoras trilineatus
Most 'Julii Cory' sold in stores are actually this species. A lovely shoaling catfish with three dark lines along the flanks.
Trichopodus trichopterus
The hardy 'Blue Gourami', available in many color morphs. Males can be aggressive with each other; a good snail-control fish.
Puntigrus tetrazona
An iconic striped barb with a reputation for fin nipping — avoid it with long-finned fish unless kept in a group of 8 or more.
Zebrasoma flavescens
A bright yellow surgeonfish that needs a very large tank and plenty of grazing rock.
Botia striata
A beautiful black-and-gold loach that lives for a decade or more. Needs sand substrate to protect its barbels and a group of 5 or more.
Pseudotropheus zebra
An aggressive African cichlid that needs a hard, alkaline Malawi tank. Not for beginners or community tanks.
Danio rerio
An energetic, hardy fish with horizontal stripes. A great beginner species that thrives in cooler water.
