You should not try to keep the two together if you have not done enough research or haven’t set up the tank in the most efficient way. Make sure to give both your betta and crayfish enough space within the tank, with a taller tank being better than a longer tank.

Can you put a crayfish with a betta?

Luckily one dwarf crayfish and one betta can live in a 5-gallon tank together (A great tank for dwarf crayfish and bettas is the Fluval Spec 5 Gallon). Dwarf crayfish are very territorial and if your tank is too small they’ll end up fighting each other.

Will crayfish kill my fish?

Crayfish don’t get the kill in one strike always, but they can wound a fish repeatedly until the fish is stressed and weakened. Then, your fish is crayfish food. [This Should Help Keep Your Tank Clean] So yes, crayfish can and will eat your fish if given the opportunity.

Best Betta Fish Tank Mates: What Fish Can Live With Bettas?
Cory catfish.Neon and ember tetras.Ghost shrimp.African dwarf frogs.Guppies.Kuhli loaches.