Skip to main content
Compatibility

Compatibility brief

Can Angelfish live with Harlequin Rasbora?

Angelfish

Angelfish

Pterophyllum scalare

semi-aggressive~20cm
Harlequin Rasbora

Harlequin Rasbora

Trigonostigma heteromorpha

peaceful~5cm
VerdictCAUTION

Caution. Check the issues below before buying.

Angelfish + Harlequin Rasbora: Temperament difference. Angelfish is semi-aggressive, while Harlequin Rasbora is peaceful. Expect chasing or stress unless the tank is large and heavily structured — monitor closely. Outcomes still depend on your tank shape, maintenance routine, and individual fish.

Compatibility score

72/100

Profile confidence: medium

Order of checkstank volume vs adults → predation mouth gap → temperament / fin nipping → shared water windows.

Min tank

150L

Combined minimum footprint reference for these two species: about 150L (larger active fish often want more length).

Temperature
Range in °C24–27°C shared
AngelfishHarlequin RasboraShared window
pH
Range6.5–7.5 shared
AngelfishHarlequin RasboraShared window
Size / predation

Angelfish (20cm adult) may treat small Harlequin Rasbora (~5cm) as food once grown — plan adult sizes, not shop sizes.

Temperament / behaviour

Harlequin rasboras are peaceful midwater schoolers; adult angelfish are semi-aggressive cichlids that claim vertical territory once a pair forms. Water overlap is usually workable, and harlequins are large enough to avoid neon-style swallowing. The limit is bullying: chasing, fin nipping at spawn time, or a school that refuses to leave cover because an angel owns the open column. Tall tanks with broken sight lines help; they do not remove cichlid hierarchy.

Assessment details

  1. Temperament difference

    Top issue

    Angelfish is semi-aggressive, while Harlequin Rasbora is peaceful. Expect chasing or stress unless the tank is large and heavily structured — monitor closely.

  2. Compatible temperature range

    Both fish can comfortably share similar water temperatures.

“Angelfish is semi-aggressive, while Harlequin Rasbora is peaceful”

Temperament difference

Next steps

Concrete changes, not "research more" filler.

  • •Use a tall planted tank, keep a full harlequin school of eight or more, and watch daily once angels pair. Rehome harlequins at persistent chasing, or keep rasboras without a cichlid centrepiece.
  • •Provide plenty of hiding spots and visual breaks so Harlequin Rasbora can escape if harassed.
  • •Harlequin Rasbora should be kept in a group of at least 6 for best health and behaviour.
Sources from both profiles
Only URLs that exist on the species records are shown. We do not fabricate citations.

Try this next

Build the full stocking list with Angelfish + Harlequin Rasbora

Compare another pairOpen tank builder

Plan further

Check each species’ mates list, size the glass, then verify the full stock in the builder. Methodology explains how verdicts are produced.

Individual fish vary in personality. Fishori uses conservative hobby rules. Observe any new introduction closely, feed thoughtfully, and keep a quarantine or backup plan. This is not veterinary advice.

Profile data confidence: high. Checked against several solid care sources that mostly agree.

Full tank-mate guides

Related pair checks

Angelfish + Harlequin Rasbora — common questions

Can Angelfish live with Harlequin Rasbora?
Yes, if you plan for it. The verdict is CAUTION: water and size usually align, but semi-aggressive angelfish can still bully peaceful harlequin rasboras when territory tightens. Monitor chasing — especially when a pair forms.
What tank size do you need for Angelfish and Harlequin Rasbora together?
Plan around 150 litres as the working minimum. That figure comes from each species' published minimum and their group needs, and it assumes adult sizes, not shop sizes.
What's the main risk?
Temperament difference. That is the first thing to plan around. The matching entry under assessment details on this page explains the reasoning and the numbers behind it.
What should you check before buying?
Provide plenty of hiding spots and visual breaks so Harlequin Rasbora can escape if harassed. Harlequin Rasbora should be kept in a group of at least 6 for best health and behaviour.