Can rams live with crayfish?

Verdict
No

No. Rams and crayfish should not share a tank. No shared temperature. Rams need 80–86°F, crayfish need 65–77°F.

German blue ramGerman blue ram80–86°F · pH 5–7 CrayfishCrayfish65–77°F · pH 6.5–8

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°German blue ram 80–86°Crayfish 65–77°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 6.5–7German blue ram 5–7Crayfish 6.5–8
The green band is the pH both tolerate.

Size to scale

German blue ram · 2.5 inCrayfish · 5 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 ramCrayfish
Temperature80–86 °F65–77 °F
pH5–76.5–8
Adult size2.5 in5.0 in
Minimum tank20 gal20 gal
TemperamentPeacefulAggressive
Swims atBottomBottom
GroupAlone or in pairsOne per tank
DietOmnivoreOmnivore

Better tank mates for rams

All german blue ram tank mates

Better tank mates for crayfish

All crayfish tank mates

Questions

Can rams live with crayfish?

No. Rams and crayfish should not share a tank. No shared temperature. Rams need 80–86°F, crayfish need 65–77°F.

What temperature suits both rams and crayfish?

None. Rams need 80–86 °F and crayfish need 65–77 °F, so the ranges do not meet.

What size tank do rams and crayfish need together?

At least 20 gal, set by the german blue ram. Add space for each extra fish.