Can rams live with upside down catfish?

Verdict
No

No. Rams and upside down catfish should not share a tank. No shared temperature. Rams need 80–86°F, upside down catfish need 72–79°F.

German blue ramGerman blue ram80–86°F · pH 5–7 Upside down catfishUpside down catfish72–79°F · pH 6–7.5

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°German blue ram 80–86°Upside down catfish 72–79°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 6–7German blue ram 5–7Upside down catfish 6–7.5
The green band is the pH both tolerate.

Size to scale

German blue ram · 2.5 inUpside down catfish · 4 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

German blue ramUpside down catfish
Temperature80–86 °F72–79 °F
pH5–76–7.5
Adult size2.5 in4.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulPeaceful
Swims atBottomBottom
GroupAlone or in pairsGroups of 3+
DietOmnivoreOmnivore

Better tank mates for rams

All german blue ram tank mates

Better tank mates for upside down catfish

All upside down catfish tank mates

Questions

Can rams live with upside down catfish?

No. Rams and upside down catfish should not share a tank. No shared temperature. Rams need 80–86°F, upside down catfish need 72–79°F.

What temperature suits both rams and upside down catfish?

None. Rams need 80–86 °F and upside down catfish need 72–79 °F, so the ranges do not meet.

What size tank do rams and upside down catfish need together?

At least 30 gal, set by the upside down catfish. Add space for each extra fish.