Can neon tetras live with siamese algae eaters?

Verdict
Yes

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

Neon tetraNeon tetra72–79°F · pH 6–7 Siamese algae eaterSiamese algae eater75–79°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–79°Neon tetra 72–79°Siamese algae eater 75–79°
The green band is the temperature range both can live in.
456789Both: 6.5–7Neon tetra 6–7Siamese algae eater 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Neon tetra · 1.5 inSiamese algae eater · 6 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

Neon tetraSiamese algae eater
Temperature72–79 °F75–79 °F
pH6–76.5–7.5
Adult size1.5 in6.0 in
Minimum tank10 gal30 gal
TemperamentPeacefulPeaceful
Swims atMiddleBottom
GroupGroups of 6+Alone or in pairs
DietOmnivoreHerbivore

Better tank mates for neon tetras

All neon tetra tank mates

Better tank mates for siamese algae eaters

All siamese algae eater tank mates

Questions

Can neon tetras live with siamese algae eaters?

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

What temperature suits both neon tetras and siamese algae eaters?

75–79 °F. Neon tetras need 72–79 °F, siamese algae eaters need 75–79 °F.

What size tank do neon tetras and siamese algae eaters need together?

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