Can siamese algae eaters live with hatchetfish?

Verdict
Yes

Yes. Siamese algae eaters and hatchetfish get along in the same tank. Both are fine at 75–79°F. Plan on at least 30 gal.

Siamese algae eaterSiamese algae eater75–79°F · pH 6.5–7.5 HatchetfishHatchetfish75–81°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–79°Siamese algae eater 75–79°Hatchetfish 75–81°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Siamese algae eater 6.5–7.5Hatchetfish 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Siamese algae eater · 6 inHatchetfish · 1.5 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

Siamese algae eaterHatchetfish
Temperature75–79 °F75–81 °F
pH6.5–7.55.5–7.5
Adult size6.0 in1.5 in
Minimum tank30 gal20 gal
TemperamentPeacefulPeaceful
Swims atBottomTop
GroupAlone or in pairsGroups of 6+
DietHerbivoreCarnivore

Better tank mates for siamese algae eaters

All siamese algae eater tank mates

Better tank mates for hatchetfish

All hatchetfish tank mates

Questions

Can siamese algae eaters live with hatchetfish?

Yes. Siamese algae eaters and hatchetfish get along in the same tank. Both are fine at 75–79°F. Plan on at least 30 gal.

What temperature suits both siamese algae eaters and hatchetfish?

75–79 °F. Siamese algae eaters need 75–79 °F, hatchetfish need 75–81 °F.

What size tank do siamese algae eaters and hatchetfish need together?

At least 30 gal, set by the siamese algae eater. Add space for each extra fish.