The Leopard Angelfish is one of the most requested spotted strains of Pterophyllum scalare, and one of the most misunderstood. Buyers see a mature fish peppered with clean, evenly spaced black dots, order a batch of half-dollar juveniles, then wonder why the fish that arrive look only lightly freckled. Nothing went wrong — that is how this pattern develops. Below: what the leopard pattern is, how it shifts over a fish’s lifetime, how it differs from marble and black splash, and how to keep one properly.
| Scientific name | Pterophyllum scalare (line-bred Leopard strain) |
| Common names | Leopard Angelfish, Leopard Scalare, Spotted Marble Angelfish |
| Adult size | 5–6 in body height, 8–10 in tall with fins |
| Minimum tank | 29 gallons for a pair; 55 gallons or larger for a group of 5–6 |
| Water parameters | 78–82°F, pH 6.5–7.5, 3–10 dKH, ammonia/nitrite 0 ppm, nitrate under 20 ppm |
| Temperament | Peaceful community fish; territorial once paired and spawning |
| Care level | Easy to moderate; water quality matters most |
| Lifespan | 8–10 years in well-maintained aquariums |
What a Leopard Angelfish Actually Is
Leopard is not a species and not a wild fish. It is a line-bred domestic strain of Pterophyllum scalare selected over generations for one look: numerous small, discrete black spots spread fairly evenly over a silver or pale body, rather than the large connected swirls of a classic marble. Every Leopard Angelfish we ship is tank-raised domestic scalare, which is why it adapts to ordinary aquarium water far more easily than a wild altum.
Breeders generally describe the leopard look as sitting on the marble side of the Dark locus — the same gene complex behind marble, black lace, and black angelfish. In practice, leopard behaves like a marble whose pigment has been broken into many small islands instead of running together into broad bands. Whether a given fish is homozygous or heterozygous at that locus is not something anyone can read off a photo, so treat hard genetic claims with skepticism. What breeders can say honestly is that leopard-to-leopard pairings throw a high percentage of spotted fry, with variable spot density in every batch.
For how leopard sits alongside koi, blue, gold, and black strains, our angelfish color morph comparison covers the whole domestic lineup. This guide stays on the spotted end of it.
How the Spots Change With Age and Mood
This is where most online angelfish disappointment comes from. The leopard pattern is not fixed; it changes on two very different timescales.
Over months and years
Juveniles at nickel to quarter size usually show fewer, fainter spots than the adults in the photos that sold you on the strain. Melanophore pigment keeps being recruited as the fish grows, so a lightly freckled 1.5 in juvenile at four months often becomes a densely spotted adult by 10–14 months. Spot count generally increases with age, but at different rates in siblings from one spawn — two fry from the same batch can end up meaningfully different at maturity.
Over hours
Angelfish control their melanophores actively. A settled fish over dark substrate shows its spots at full contrast; the same fish after a water change, a net chase, or a bag ride can go pale enough that the spots nearly vanish, or darken into a smudged blotch. Hormonal state does the same — fish coming into spawning condition frequently intensify. None of this is disease. If the pattern shifts within hours and the fish is eating, breathing normally, and holding its fins up, it is behaving exactly as expected.
Buy a leopard for the strain, not for a specific arrangement of dots. If you want a heavy, high-contrast pattern with certainty, buy larger fish that have already developed, and give any new arrival two to three weeks of stable conditions before judging color. Our guide to buying angelfish online covers sizing and timing in more depth.
Leopard vs. Marble vs. Black Splash vs. Koi
These four strains overlap enough that photos alone mislead. Care requirements are effectively identical across all of them, so choose on looks. The practical differences:
- Leopard — many small, separated, roughly round spots spread evenly over a light body. The defining trait is that the black stays broken into individual dots rather than merging.
- Marble — larger, irregular swirls and blotches that connect and flow across the body, with coverage that varies enormously between fish. See the Orange Marble and Blue Marble care guides.
- Black Splash — heavier, bolder black areas, more like patches of ink than a field of dots, and darker overall than a leopard. Details in the Black Splash Angelfish care guide.
- Koi — white body with orange on the crown and shoulders plus black markings, the orange itself responding to diet and stress. A Premium Koi Angelfish is a different visual target built on the same marble foundation.
Tank Size and Water Parameters
Angelfish are tall, so vertical space matters more than footprint. A 20-gallon high is the absolute floor for one adult. Plan 29 gallons minimum for an established pair and 55 gallons or more for a group of five or six grown out together — the standard way to let a pair form. At least 18 in of height keeps long ventral filaments from folding permanently.
- Temperature: 78–82°F. Grow out near 82°F; 78–80°F suits settled adults.
- pH: 6.5–7.5. Domestic scalare are tolerant — stability beats chasing a number.
- Hardness: 3–10 dKH. Very soft water is only needed for hatching eggs.
- Ammonia and nitrite: 0 ppm, always. Nitrate under 20 ppm.
- Flow: gentle. Strong current pushes tall-bodied fish around and disrupts feeding.
- Water changes: 25–30% weekly, temperature-matched. Growing juveniles respond to more frequent changes.
Sponge filtration or a canister with baffled outflow both work; the goal is high biological capacity with low surface turbulence, and our water parameters cheat sheet is handy if you run several species. For scaping, tall Vallisneria and Amazon swords give vertical cover and a spawning surface; darker substrate and moderate lighting make spot contrast read better.
Diet
Leopard Angelfish are unfussy omnivores that lean carnivorous. Feed two to three small meals a day for juveniles under 3 in, once or twice for adults, sized so everything is gone in about two minutes.
- A quality slow-sinking pellet or flake as the staple, ideally 40%+ protein for growing fish.
- Frozen bloodworms, brine shrimp, mysis, and daphnia two to four times a week — bloodworms condition well but should not be the diet’s base.
- Live baby brine shrimp for fry and small juveniles — nothing else drives early growth as well.
- Some vegetable content — spirulina flake or blanched greens — keeps digestion steady.
Diet affects pigment: a fish on a varied diet in clean water shows better black density and a cleaner white base than the same fish on thin flake alone. It will not, however, add spots the genetics did not put there.
Temperament and Tankmates
Outside of breeding, a Leopard Angelfish is a calm, slow-moving community cichlid. Once a pair forms and claims a spawning site that changes: they defend their corner aggressively, and in a 29-gallon tank a determined pair makes life unpleasant for everything else.
Good tankmates: corydoras, larger tetras such as rummy-nose or black skirt, rasboras, bristlenose plecos, and apistogramma at the far end of a longer tank. Avoid fin-nippers — tiger barbs and serpae tetras are the classic mistakes — and anything small enough to fit in an adult angel’s mouth, which means neon tetras and shrimp are food, not tankmates.
Keep leopards as a bonded pair or a group of five or six. Groups of three or four end badly: two fish pair off and the odd ones out absorb all the aggression. Mixing leopards with other domestic strains is fine socially — just note the fry will be crossbred and will not breed true.
Breeding and Pairing
Leopards are not reliably sexually dimorphic until they spawn, so grow out a group of six and let a pair form on its own, usually between 8 and 12 months. You will know because two fish start cleaning a vertical surface — a sword leaf, a piece of slate, an intake tube — and driving everyone else off it.
Condition the pair on frozen and live foods for two weeks, hold 80–82°F, and do slightly larger water changes. A typical spawn runs 200–600 eggs, with free-swimming fry roughly 5–7 days after laying; they take baby brine shrimp almost immediately. First-time parents commonly eat the first two or three clutches — normal, and not a reason to split the pair. For reliable yields, move the spawning surface to a bare tank with an air stone and a few drops of methylene blue. Expect spot density to vary across the batch even when both parents are heavily spotted.
Unboxing and Acclimation After Overnight Shipping
Every order from Amazonia Tropical Fish LLC leaves Philadelphia, PA by FedEx Priority Overnight, UPS Next Day Air, or Southwest Cargo, so fish are in transit well under 24 hours. Before packing they go through a multi-week quarantine with prophylactic treatment for internal and external parasites, and we confirm each fish is eating before listing it. Free shipping applies over $350 in the continental U.S.
Our 100% Live Arrival Guarantee requires photos of the fish in the unopened bag within one hour of delivery, and a valid claim is settled as store credit; shipping charges are non-refundable. The order of operations matters — photograph first, open second.
- Open the box in dim light and photograph every bag first.
- Float the sealed bags 15–20 minutes to equalize temperature.
- Do not pour shipping water into the tank. Net the fish across, or drip acclimate in a separate container for 30–45 minutes first.
- Leave the lights off the rest of the day and do not feed until the next morning.
- Expect washed-out color for 24–72 hours. A leopard fresh out of the bag often shows almost no spots — it comes back.
What to Look For When Buying a Leopard Angelfish Online
- Ask what size ships. Body size in inches, not vague “juvenile” language — spot expression at 1 in and at 3 in are entirely different propositions.
- Assume representative photos. Unless a seller offers pick-your-fish, images show the strain, not the individual you receive — and an honest seller says so.
- Confirm quarantine and feeding. A fish treated for parasites and observed eating is worth far more than an untreated transshipped import.
- Buy enough fish. Five or six, not two individuals you hope will pair.
- Check the arrival window. Someone has to be home to photograph and unbox within the hour.
Treat the pattern as a moving target and leopards are one of the most rewarding domestic scalare strains available — the spots keep developing for the better part of a year. Current stock is on the Leopard Angelfish product page.