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Do be aware that large crustaceans can injure or kill fish. A big puffer can handle a small crayfish, but the puffer needs to be quite a bit bigger that its prey. I'm sure some specimens are smart enough to avoid large crayfish, maybe even take them down a leg at a time, but I wouldn't risk it. If your puffer is happy to eat frozen unshelled prawns, then the safe option is to stick with them, and obviously the nutrition is identical.