I kno green spotted puffers eat snails to file their beaks but im having s difficult time getting them and getting them to breathe. What foods help file their beaks? Im looking into ghost shrimp. Are the shells of a ghost shrimp hard enough to file a gsp beak? Please help! I cant seem to find a definite answer on this. I want ghosts if they work because they are fairly inexpensive and i can try to breed them and they dont trash my tank like a snail..