Pairing guidance · no mystery score

Two fish can share water and still not share a life.

Compare the constraints that matter, see where uncertainty remains and move the result into a full tank plan.

First inhabitantSecond inhabitant

Planning assessment

Compatible

Ember tetra and Ember tetra show a workable baseline across the data held here, provided the aquarium meets both species' full needs.

Temperature overlap6.0°C band

pH overlap2.0 pH band

Adult size / predationno obvious size conflict

Behaviourpeaceful + peaceful

Compatibility depends on individual behaviour, tank dimensions, water quality, group size, layout and husbandry. Use this as a starting point and monitor animals closely.

Read Ember tetra profile Test in a tank plan

Popular comparisons

Direct answers to common pair questions

Betta fish and Guppy

Compare shared water, adult size, behaviour and minimum footprint.

Betta fish and Cherry shrimp

Compare shared water, adult size, behaviour and minimum footprint.

Betta fish and Fancy goldfish

Compare shared water, adult size, behaviour and minimum footprint.

Freshwater angelfish and Guppy

Compare shared water, adult size, behaviour and minimum footprint.

Freshwater angelfish and Fancy goldfish

Compare shared water, adult size, behaviour and minimum footprint.

Axolotl and Fancy goldfish

Compare shared water, adult size, behaviour and minimum footprint.

01

Hard constraints

Water with no overlap, insufficient footprint and clear predation risk can rule a pairing out.

02

Soft constraints

Territory, fin shape, group size, feeding access and layout change the level of caution.

03

Observed reality

Monitor animals, keep a separation plan and treat individual behaviour as new evidence.