I am quite fond of crayfish myself. Many of them are beautifully colored, and they are active and entertaining aquarium subjects.

Here's a wild pair mating; I don't know the ID.


I should point out that just because two species inhabit the same space does not mean that they are compatible; after all, predators live where their prey live. In any case, crayfish are capable of great destruction, especially to soft-bodied animals like amphibians, even if they do not wish to eat the amphibians.

I would like to amend my previous blanket statement by saying that dwarf crayfish (Cambarellus species) are compatible with many other aquatic species. I have not kept them with newts, but I expect they would get along well. Of course, this doesn't help the OP who already owns a crayfish, but it might be helpful to others.

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