Can fancy goldfish live with siamese algae eaters?

Verdict
No

No. Fancy goldfish and siamese algae eaters should not share a tank. Fancy goldfish are coldwater animals (65–74°F); siamese algae eaters need 75–79°F. No temperature suits both.

Fancy goldfishFancy goldfish65–74°F · pH 7–8 Siamese algae eaterSiamese algae eater75–79°F · pH 6.5–7.5

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Fancy goldfish 65–74°Siamese algae eater 75–79°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 7–7.5Fancy goldfish 7–8Siamese algae eater 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Fancy goldfish · 6 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

Fancy goldfishSiamese algae eater
Temperature65–74 °F75–79 °F
pH7–86.5–7.5
Adult size6.0 in6.0 in
Minimum tank30 gal30 gal
TemperamentPeacefulPeaceful
Swims atAll levelsBottom
GroupAlone or in pairsAlone or in pairs
DietOmnivoreHerbivore

Better tank mates for fancy goldfish

All fancy goldfish tank mates

Better tank mates for siamese algae eaters

All siamese algae eater tank mates

Questions

Can fancy goldfish live with siamese algae eaters?

No. Fancy goldfish and siamese algae eaters should not share a tank. Fancy goldfish are coldwater animals (65–74°F); siamese algae eaters need 75–79°F. No temperature suits both.

What temperature suits both fancy goldfish and siamese algae eaters?

None. Fancy goldfish need 65–74 °F and siamese algae eaters need 75–79 °F, so the ranges do not meet.

What size tank do fancy goldfish and siamese algae eaters need together?

At least 30 gal, set by the fancy goldfish. Add space for each extra fish.