Dump the crayfish, they are too good of a predator, you will likely lose any aquatic creatures you add. You should be thinking of animals that don't compete with each other, for example you are not going to keep any fish with a watersnake, or gartersnake, and it's a safe bet that amphibians would be out too. I suggest anoles, geckos, green tree frogs(not whites or some other species! Hyla cinerea), rough green snake,small aquatic newts,dwarf sirens and african dwarf frogs. With these you can keep tropical fish. If you want to go high end, Large species of dart frogs instead of treefrogs, and small day geckos instead of anoles. If you do this you will have to have plenty of greenery and hiding spaces a "community" environment increases the stress for all. I've kept rough green snakes with lizard before without a problem, however doing so drastically increases the stress levels of the other animals, let us know how it goes, good luck!

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