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Compatibility

Compatibility brief

Can German Blue Ram live with Harlequin Rasbora?

German Blue Ram

German Blue Ram

Mikrogeophagus ramirezi

peaceful~7cm
Harlequin Rasbora

Harlequin Rasbora

Trigonostigma heteromorpha

peaceful~5cm
VerdictCAUTION

Caution. Check the issues below before buying.

German Blue Ram + Harlequin Rasbora: Narrow temperature overlap. German Blue Ram and Harlequin Rasbora have only a narrow shared temperature range. Maintaining stable water temperature will be important. 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

80L

Combined minimum footprint reference for these two species: about 80L (larger active fish often want more length).

Temperature
Range in °C26–27°C shared
German Blue RamHarlequin RasboraShared window
pH
Range6–7 shared
German Blue RamHarlequin RasboraShared window

Assessment details

  1. Compatible temperaments

    Both German Blue Ram and Harlequin Rasbora share a peaceful temperament.

  2. Narrow temperature overlap

    Top issue

    German Blue Ram and Harlequin Rasbora have only a narrow shared temperature range. Maintaining stable water temperature will be important.

“German Blue Ram and Harlequin Rasbora have only a narrow…”

Narrow temperature overlap

Next steps

Concrete changes, not "research more" filler.

  • •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 German Blue Ram + 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

German Blue Ram + Harlequin Rasbora — common questions

Can German Blue Ram live with Harlequin Rasbora?
Yes, if you plan for it. The verdict is CAUTION, which means the pairing works when specific conditions are met, not by default. The first condition: Harlequin Rasbora should be kept in a group of at least 6 for best health and behaviour.
What tank size do you need for German Blue Ram and Harlequin Rasbora together?
Plan around 80 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?
Narrow temperature overlap. 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.