Hi Gordy, Miminnow species are realy beautiful, My fish pond has mainly native species but I'm trying to put "Exotic Species" like water snails, and some kind of south American and asiatic fish Species that could survive in portuguese Winter. My region is hot and dry in Summer (never rains), and moderatly cold on winter (around 7-10 degrees Celcius (50 F), summarizing we have an mediterranean climate with four seasons very differents. About Crayfish, I really love them, I have red and quite tradicional lineage. the blue one is very very beatiful however you need very specifics features like soil and another one to create blue, marrom etc. crayfish but I'm studying a way to create them.