Red-tailed black shark compatibility
Every pairing AquariumHQ has assessed for Red-tailed black shark, derived from stored behavioural and environmental traits. Each verdict links to the reasoning behind it — including where the evidence runs out.
The species record is on the Red-tailed black shark page. Any pairing not listed here can be assessed on demand with the compatibility checker.
What decides this species' pairings
Counted across every assessment above — the dimensions that actually raise concerns for this animal, rather than the ones a care sheet would list.
| Dimension | Pairings raising it | Share |
|---|---|---|
| territory | 51 | 57% |
| temperature | 43 | 48% |
| zone competition | 30 | 33% |
| breeding aggression | 27 | 30% |
| aggression | 15 | 17% |
| ph | 14 | 16% |
Environmental compromise
Whether a shared temperature, pH and hardness band exists is a necessary condition, not evidence that it suits both animals. This counts how good the overlap actually is.
| Overlap quality | Pairings |
|---|---|
| Workable | 38 |
| Comfortable for both | 28 |
| Forced compromise — neither animal is where it wants to be | 18 |
| One animal at the edge of its range | 4 |
| No overlap at all | 2 |
Every assessed pairing
Grouped by verdict, worst first.
Incompatible (13)
Should not be attempted. At least one factor is expected to cause harm.
- with Black ghost knifefish5 concerns
- with Clown knifefish3 concerns
- with Discus3 concerns
- with Frontosa3 concerns
- with Giant gourami6 concerns
- with Gold nugget pleco3 concerns
- with Iridescent shark1 concern
- with Koi carp3 concerns
- with Oscar4 concerns
- with Redtail catfish4 concerns
- with Rope fish5 concerns
- with Senegal bichir5 concerns
- with Silver arowana3 concerns
Poor match (24)
Workable only in unusual circumstances. Not a pairing to plan around.
- with Angelfish4 concerns
- with Bleeding heart tetra3 concerns
- with Convict cichlid3 concerns
- with Dwarf gourami4 concerns
- with Electric blue hap3 concerns
- with Electric yellow cichlid3 concerns
- with Flavescent peacock5 concerns
- with German blue ram4 concerns
- with Goldfish2 concerns
- with Green terror2 concerns
- with Guppy2 concerns
- with Honey gourami2 concerns
- with Jack Dempsey3 concerns
- with Jewel cichlid2 concerns
- with Moonlight gourami4 concerns
- with Mystery snail2 concerns
- with Nerite snail2 concerns
- with Pearl gourami4 concerns
- with Rainbow shark2 concerns
- with Red swamp crayfish3 concerns
- with Red zebra cichlid4 concerns
- with Severum3 concerns
- with Siamese fighting fish6 concerns
- with White Cloud Mountain minnow1 concern
Conditional (15)
Can work, but only if the stated conditions are met.
- with Amano shrimp4 concerns
- with American flagfish4 concerns
- with Blue acara3 concerns
- with Cardinal tetra3 concerns
- with Cherry shrimp4 concerns
- with Chili rasbora4 concerns
- with Ember tetra1 concern
- with Firehead tetra3 concerns
- with Firemouth cichlid3 concerns
- with Ghost shrimp3 concerns
- with Kribensis3 concerns
- with Molly3 concerns
- with Peppered corydoras3 concerns
- with Rummy-nose tetra2 concerns
- with Sailfin molly2 concerns
Generally compatible (24)
Usually works. Minor points to watch are listed below.
- with Bladder snail2 concerns
- with Bloodfin tetra1 concern
- with Bolivian ram3 concerns
- with Bristlenose pleco2 concerns
- with Bronze corydoras2 concerns
- with Celestial pearl danio1 concern
- with Clown loach3 concerns
- with Common pleco2 concerns
- with Doctor fish3 concerns
- with Eastern rainbowfish1 concern
- with Kissing gourami1 concern
- with Kuhli loach3 concerns
- with Otocinclus1 concern
- with Panda corydoras3 concerns
- with Pea puffer1 concern
- with Peacock gudgeon3 concerns
- with Pictus catfish2 concerns
- with Pygmy corydoras1 concern
- with Siamese algae eater2 concerns
- with Silver dollar1 concern
- with Skunk loach3 concerns
- with Upside-down catfish1 concern
- with Yoyo loach2 concerns
- with Zebra danio1 concern
Compatible (14)
Requirements align and no behavioural conflict is expected.
- with Bala sharkno concerns
- with Black ruby barbno concerns
- with Cherry barbno concerns
- with Golden wonder killifishno concerns
- with Harlequin rasborano concerns
- with Indian glassfishno concerns
- with Neon tetrano concerns
- with Platyno concerns
- with Red-eye tetrano concerns
- with Scissortail rasborano concerns
- with Serpae tetrano concerns
- with Swordtailno concerns
- with Tiger barbno concerns
- with Tinfoil barbno concerns
Verdict distribution
| Verdict | Pairings | What it means |
|---|---|---|
| Poor match | 24 | Workable only in unusual circumstances. Not a pairing to plan around. |
| Generally compatible | 24 | Usually works. Minor points to watch are listed below. |
| Conditional | 15 | Can work, but only if the stated conditions are met. |
| Compatible | 14 | Requirements align and no behavioural conflict is expected. |
| Incompatible | 13 | Should not be attempted. At least one factor is expected to cause harm. |