Can guppies live with siamese algae eaters?

Verdict
Yes

Yes, guppies and siamese algae eaters can live together. Both are fine at 75–79°F. Plan on at least 30 gal.

GuppyGuppy72–82°F · pH 6.8–7.8 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°Guppy 72–82°Siamese algae eater 75–79°
The green band is the temperature range both can live in.
456789Both: 6.8–7.5Guppy 6.8–7.8Siamese algae eater 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Guppy · 2 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

GuppySiamese algae eater
Temperature72–82 °F75–79 °F
pH6.8–7.86.5–7.5
Adult size2.0 in6.0 in
Minimum tank10 gal30 gal
TemperamentPeacefulPeaceful
Swims atTopBottom
GroupGroups of 3+Alone or in pairs
DietOmnivoreHerbivore

Better tank mates for guppies

All guppy tank mates

Better tank mates for siamese algae eaters

All siamese algae eater tank mates

Questions

Can guppies live with siamese algae eaters?

Yes, guppies and siamese algae eaters can live together. Both are fine at 75–79°F. Plan on at least 30 gal.

What temperature suits both guppies and siamese algae eaters?

75–79 °F. Guppies need 72–82 °F, siamese algae eaters need 75–79 °F.

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

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