I am going to order some H.Armatus from infinite and have them shipped to Canada. How many should a guy order to beat the odds and have at least one in the end that grows to a big size. What size tank has everyone been putting these little monsters into? Would 3 or 4 work in a 90 gallon for now so they can catch the guppys or would that be to small for them and they would start killing each other. I was going to put them in a 180 gallon but some say that's to big right now for how small they are.