snails crabs and other inverts are the puffers natual food. I had two spotted puffers. They were cool to watch. I was told that if the puffers are small and the invets were big enough that you wouldnt have a problem. So I got some big turbo snail. The puffers would turn the snails over and rip it out of the shell. And I feed Them Very well, so they werent starving That was just my experience. I dont know of any that are safe with inverts but if I read about any I will post