Can pearl gouramis live with pencilfish?

Verdict
Yes

Yes. Pearl gouramis and pencilfish make a good pair. Both are fine at 77–82°F. Plan on at least 30 gal.

Pearl gouramiPearl gourami77–82°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: 77–82°Pearl gourami 77–82°Pencilfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6–7.5Pearl gourami 6–7.5Pencilfish 5–7.5
The green band is the pH both tolerate.

Size to scale

Pearl gourami · 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

Pearl gouramiPencilfish
Temperature77–82 °F75–82 °F
pH6–7.55–7.5
Adult size5.0 in2.0 in
Minimum tank30 gal15 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for pearl gouramis

All pearl gourami tank mates

Better tank mates for pencilfish

All pencilfish tank mates

Questions

Can pearl gouramis live with pencilfish?

Yes. Pearl gouramis and pencilfish make a good pair. Both are fine at 77–82°F. Plan on at least 30 gal.

What temperature suits both pearl gouramis and pencilfish?

77–82 °F. Pearl gouramis need 77–82 °F, pencilfish need 75–82 °F.

What size tank do pearl gouramis and pencilfish need together?

At least 30 gal, set by the pearl gourami. Add space for each extra fish.