Can platies live with siamese algae eaters?

Verdict
Yes

Yes. Platies and siamese algae eaters make a good pair. Both are fine at 75–79°F. Plan on at least 30 gal.

PlatyPlaty70–80°F · pH 7–8.2 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°Platy 70–80°Siamese algae eater 75–79°
The green band is the temperature range both can live in.
456789Both: 7–7.5Platy 7–8.2Siamese algae eater 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Platy · 2.5 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

PlatySiamese algae eater
Temperature70–80 °F75–79 °F
pH7–8.26.5–7.5
Adult size2.5 in6.0 in
Minimum tank10 gal30 gal
TemperamentPeacefulPeaceful
Swims atMiddleBottom
GroupGroups of 3+Alone or in pairs
DietOmnivoreHerbivore

Better tank mates for platies

All platy tank mates

Better tank mates for siamese algae eaters

All siamese algae eater tank mates

Questions

Can platies live with siamese algae eaters?

Yes. Platies and siamese algae eaters make a good pair. Both are fine at 75–79°F. Plan on at least 30 gal.

What temperature suits both platies and siamese algae eaters?

75–79 °F. Platies need 70–80 °F, siamese algae eaters need 75–79 °F.

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

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