I will get my first octopus on Tuesday. All I know for sure is that he is "small enough to fit into an egg with room to spare". It is believed he is NOT a pigmy with the possibility of being Briaius (I hope) or Vulgaris. I have been keeping guppies and one guppy sized hitch hiking fish in his tank as a bioload during cycling (5 months). I would like to leave the fish as food or food producers. I had expected the octopus to be larger (I have been waiting for a healthy one caught by a crabber in the keys) but it has turned out the my first little fellow is quite small (hopefully a baby). I have noticed that fish in general have not been recommended but these are not damsels and are far smaller than any of the fish discussed. Am I still facing a possible problem by allowing the guppies to remain? Thanks!