Pairing guidance · no mystery score
Two fish can share water and still not share a life. Compare the constraints that matter, see where uncertainty remains and move the result into a full tank plan.
First inhabitant Betta fish Freshwater angelfish Guppy Endler's livebearer Platy Molly Swordtail Neon tetra Cardinal tetra Ember tetra Rummy-nose tetra Glowlight tetra Black skirt tetra Black neon tetra Lemon tetra Serpae tetra Congo tetra Harlequin rasbora Chili rasbora Celestial pearl danio Zebra danio Pearl danio White cloud mountain minnow Cherry barb Tiger barb Rosy barb Gold barb Bronze corydoras Panda corydoras Pygmy corydoras Peppered corydoras Sterbai corydoras Kuhli loach Yoyo loach Clown loach Hillstream loach Bristlenose pleco Common pleco Otocinclus catfish Pictus catfish Siamese algae eater Flying fox Dwarf gourami Honey gourami Pearl gourami Boesemani rainbowfish German blue ram Bolivian ram Apistogramma group Discus Oscar Electric blue acara Convict cichlid Firemouth cichlid Kribensis Jack Dempsey cichlid Green terror cichlid Rainbow shark Red tail shark Bala shark Senegal bichir Pea puffer Common goldfish Fancy goldfish African dwarf frog Axolotl Cherry shrimp Amano shrimp Ghost shrimp Nerite snail Mystery snail Assassin snail Rabbit snail Dwarf Mexican crayfish Bamboo shrimp + Second inhabitant Betta fish Freshwater angelfish Guppy Endler's livebearer Platy Molly Swordtail Neon tetra Cardinal tetra Ember tetra Rummy-nose tetra Glowlight tetra Black skirt tetra Black neon tetra Lemon tetra Serpae tetra Congo tetra Harlequin rasbora Chili rasbora Celestial pearl danio Zebra danio Pearl danio White cloud mountain minnow Cherry barb Tiger barb Rosy barb Gold barb Bronze corydoras Panda corydoras Pygmy corydoras Peppered corydoras Sterbai corydoras Kuhli loach Yoyo loach Clown loach Hillstream loach Bristlenose pleco Common pleco Otocinclus catfish Pictus catfish Siamese algae eater Flying fox Dwarf gourami Honey gourami Pearl gourami Boesemani rainbowfish German blue ram Bolivian ram Apistogramma group Discus Oscar Electric blue acara Convict cichlid Firemouth cichlid Kribensis Jack Dempsey cichlid Green terror cichlid Rainbow shark Red tail shark Bala shark Senegal bichir Pea puffer Common goldfish Fancy goldfish African dwarf frog Axolotl Cherry shrimp Amano shrimp Ghost shrimp Nerite snail Mystery snail Assassin snail Rabbit snail Dwarf Mexican crayfish Bamboo shrimp
! Planning assessment
Compatible with caution Endler's livebearer and Ember tetra share some workable conditions, but behaviour, adult size or limited overlap needs active planning.
Temperature overlap 5.0°C band
pH overlap 0.0 pH band
Adult size / predation review closely
Behaviour peaceful + peaceful
Compatibility depends on individual behaviour, tank dimensions, water quality, group size, layout and husbandry. Use this as a starting point and monitor animals closely.
01 Hard constraints Water with no overlap, insufficient footprint and clear predation risk can rule a pairing out.
02 Soft constraints Territory, fin shape, group size, feeding access and layout change the level of caution.
03 Observed reality Monitor animals, keep a separation plan and treat individual behaviour as new evidence.