Can sparkling gouramis live with pencilfish?

Verdict
Yes

Yes. Sparkling gouramis and pencilfish get along in the same tank. Both are fine at 75–82°F. Plan on at least 15 gal.

Sparkling gouramiSparkling gourami72–82°F · pH 6–7.5 PencilfishPencilfish75–82°F · pH 5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Sparkling gourami 72–82°Pencilfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6–7.5Sparkling gourami 6–7.5Pencilfish 5–7.5
The green band is the pH both tolerate.

Size to scale

Sparkling gourami · 1.5 inPencilfish · 2 in0"1"2"3"4"5"6"
Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

Sparkling gouramiPencilfish
Temperature72–82 °F75–82 °F
pH6–7.55–7.5
Adult size1.5 in2.0 in
Minimum tank5 gal15 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupGroups of 4+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for sparkling gouramis

All sparkling gourami tank mates

Better tank mates for pencilfish

All pencilfish tank mates

Questions

Can sparkling gouramis live with pencilfish?

Yes. Sparkling gouramis and pencilfish get along in the same tank. Both are fine at 75–82°F. Plan on at least 15 gal.

What temperature suits both sparkling gouramis and pencilfish?

75–82 °F. Sparkling gouramis need 72–82 °F, pencilfish need 75–82 °F.

What size tank do sparkling gouramis and pencilfish need together?

At least 15 gal, set by the pencilfish. Add space for each extra fish.