Can chinese algae eaters live with upside down catfish?

Verdict
Yes

Yes. Chinese algae eaters and upside down catfish get along in the same tank. Both are fine at 74–79°F. Plan on at least 75 gal.

Chinese algae eaterChinese algae eater74–80°F · pH 6–8 Upside down catfishUpside down catfish72–79°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–79°Chinese algae eater 74–80°Upside down catfish 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7.5Chinese algae eater 6–8Upside down catfish 6–7.5
The green band is the pH both tolerate.

Size to scale

Chinese algae eater · 10 inUpside down catfish · 4 in0"2"4"6"8"10"
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

Chinese algae eaterUpside down catfish
Temperature74–80 °F72–79 °F
pH6–86–7.5
Adult size10.0 in4.0 in
Minimum tank75 gal30 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomBottom
GroupAlone or in pairsGroups of 3+
DietHerbivoreOmnivore

Better tank mates for chinese algae eaters

All chinese algae eater tank mates

Better tank mates for upside down catfish

All upside down catfish tank mates

Questions

Can chinese algae eaters live with upside down catfish?

Yes. Chinese algae eaters and upside down catfish get along in the same tank. Both are fine at 74–79°F. Plan on at least 75 gal.

What temperature suits both chinese algae eaters and upside down catfish?

74–79 °F. Chinese algae eaters need 74–80 °F, upside down catfish need 72–79 °F.

What size tank do chinese algae eaters and upside down catfish need together?

At least 75 gal, set by the chinese algae eater. Add space for each extra fish.