How Many Dwarf Crayfish?

If I were to keep a tank exclusively for dwarf crayfish, how many could I put into a 60x30 (about 70 liters)

 

I'd say around 3-5.

 

That’s what? basically a 20 gallon? I think you could do 7 or 8. I have 8 in a 20 and haven’t lost one yet, they breed and seem to coexist peacefully.

 

Thanks guys, also sorry for the late response, been a busy time lol. My measurements were slightly off, its 60, not 70.