I purchased a new blue lobster last night for my 75 gallon tank, my tank currently has a Jack Dempsey, 1 convict, 1 red zebra, 2 plecos, 1 plalitris ( spelling?) 1 frontosa, 1 venutus. My concern is will the lobster attack my fish. A friend of mine said the lobster will kill my fish, however the man at the store said my fish are safe????