Ok I just bought a dwarf crayfish at the LFS, I did my homework and figured that in a 55g tank it would do ok with it's other tank mates (7 dwarf puffers-4 young ones and 3 adults) 2 plecos, 1 cory(leaving soon) and a cluster of fancy guppies (also leaving soon) ok tons of room, now I am just worried about him grabbing the dwarfs should I be worried or do u think they will be ok? would I be better taking him back? Let me know the truth!