Angelfish (Pterophyllum scalare) - the king of heights in a planted aquarium

The angelfish, also known asangelfish, is one of those fish that changes the perception of the aquarium: not only with its color, but above all with itssilhouette and the way it moves. The tall, laterally flattened body, long fins and calm "air" action of the water make the angelfish look like a fish designed to swim among vertical plant stems and roots - and that's exactly what happens in nature.

This is a species that can be maintained by a beginner, but in order for an angelfish to look and behave "like an angelfish", you need to understand three things: tank height, herd hierarchy andstocking selection.

Origin and natural environment

Pterophyllum scalare comes from the Amazon basin (including river systems in Brazil, Peru, Colombia). It is most often found in:

• calm branches, bays and slowly flowing channels,

• areas with submerged roots, branches and dense coastal vegetation,

• blackwater or slightly "tea" water (colored with tannins from leaves and wood).

In such places, the following are crucial: nature's biological filtration (enormity of plant mass and microorganisms), covers (roots, trunks) and vertical structures. In nature, the angelfish often stands sideways to the threat - its flattened body and stripes can "disappear" between the shadows of plants and branches.

Appearance and behavior - what is worth knowing as an aquarist

1) It's a "tall" fish, not a "long" one

The angelfish grows not only in length (usually about 12-15 cm body length), but above all in height. With its fins it can look 25-30 cm (and in good conditions it can be even more impressive).

This means that a standard "length" aquarium without height often ends with:

• bitten fins,

• figure deformation,

• stress and tense behavior.

2) Scalars form a hierarchy

Young angelfish function as a group in which domination appears quite quickly. In practice:

• 1-2 individuals become "bosses",

• weaker pieces may be pushed into corners,

• If the space is too small, it causes constant stress.

Therefore we either hold:

• a pair (once chosen), or

• larger group in a suitably large tank.

3) It is a peaceful predator of microfauna

The angelfish is calm by nature, but it is a cichlid with a hunting instinct: small fish and newly born fry can be treated as food. The angelfish rarely "goes crazy", but it can "disappear" a small fish in one night.

Minimum conditions - realistic, not "store label"

Liters and dimensions (more important than the number of liters)

• Steam: reasonably from 150–200 l, tank heightmin. 45–50 cm

• Group 5–6 pcs: 250–350 l+, height50+ cm, the length of the tank makes a difference

• The bigger and higher, the more stable and calm.

Water parameters

The angelfish is quite flexible, but looks and reproduces best with stable parameters:

• Temperatura: 25–28°C

• pH: 6.0–7.2 (often optimum around 6.5–6.8)

• Hardness: soft to medium

  The most important thing is not "ideal pH", butstability + water quality.

Filtration and substitutions

Angelfish do not like dirty water, especially chronically elevated nitrates.

• strong biological filtration,

• regular water changes (classically 25-40% per week, depending on the stocking rate and feeding),

• good oxygenation without a "washing machine" (they do not have to like very strong current).

Arrangement for angelfish - how to create an aquarium in which they feel "at home"

Plants and structures

Angelfish love:

• vertical plants (e.g. tall stems, vallisneria),

• roots and branchesthat divide the space,

• places of "penumbra".

Subsoil

There is no great philosophy: fine sand/gravel. If there are cuirass in the cast, then sand is a big plus.

Light

In nature, it is often twilight with spots of light. In the aquarium:

• shadow zones work better,

• floating plants and roots create atmosphere and reduce stress.

Nutrition - how to feed them so that they grow healthily and beautifully

The angelfish is omnivorous with a strong meaty twist:

• good granules/pellets for cichlids as a base,

• frozen food: artemia, krill, daphnia,

• occasionally plant foods (for balance and intestines),

• young: more often, smaller portions.

Important: angelfish have a tendency to "beg". Overfeeding is a quick way to water and health problems.

Cast selection - the most common mistakes and the best combinations

Good companions

• calm, non-biting shoals of appropriate size: larger tetras/razbors (depending on size),

• rockfish (provided that angelfish can be nervous when spawning),

• antstrus - usually OK, but keep an eye on hiding places and feeding.

Risky/problematic fish

• very small fish (can be eaten),

• aggressive fin biters,

• overly energetic species that stress angelfish,

• "bad pairs" in a tank that is too small (constant conflicts).

Reproduction (for enthusiasts)

Angelfish can form stable pairs and lay eggs on:

• leaf,

• vertical glass,

• root,

• flat stone.

The pair guards the eggs, but in community aquariums this often ends with:

• eating the eggs (stress),

• fry being eaten by other fish,

• fight for territory.

If you really want to breed: a separate spawning aquarium and peace are essential.

Health and stress signals - what to look for

The scalar "speaks" in body:

• ragged fins and "hunched" silhouette → stress/conflicts or bad water,

• fading → stress, parameters, too bright/empty,

• clamped fins → often the beginning of problems,

• chafe → parasites or water problems.

The biggest advantage in breeding angelfish is consistency: stable water, reasonable space and appropriate stocking numbers.

Summary: who is scalar for?

The angelfish is ideal for the aquarist who:

• I want a "central" fish, elegant and intelligent,

• can plan the aquarium for altitude and peace,

• understands that a beautiful scalar is the result oftheir conditions, not just a "good specimen".

If you give it space, stability and structure, it will respond with behavior and appearance that cannot be confused with any other fish.

Freshwater fish atlas: https://spotmeup.pl/blog/zwierzeta-20/atlas-ryb-słodkowodnych-akwariowych-510

How to set up a decorative freshwater aquarium: https://spotmeup.pl/blog/zwierzeta-20/jak-załozyc-ozdobne-akwarium-słodkowodne-507

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