Q: White Claws

You can go to Seaview Aquarium at Seletar West... They usually have stocks for zebras...

I hope you're not mixing your zebras with other cheraxes... Zebras are the most subtle among the cheraxes... If you mix other Cheraxes in, especially destructors, I'm afraid your zebra won't be able to make it... Destructors are extremely territorial, especially to other species...

If you wanna have pairs of cheraxes without much cannibalism, you can consider getting Apricot as well... They are pretty gentle to the same species...

Maybe you might want to partition your 2 feet tank into 2, then get a pair of Apricots and Zebras... But not recommended to put them together though... Ensure that there are enough places for them to hide...

But get ready extra tanks if they start berrying (that's the term for "egg-ing" time)... All young crayfish will cannibalize each other...