I have a very makeshift setup that has survived a full year. It is only a clam shell with a thin layer of substrate. I have a clump of moss and some Vallis in a pot. There are a few charcoal logs for the shrimp to hide in, there are no filters, heaters or lights , no fish. It is kept under a pergola so gets no sun. My culls continue to breed in there - although the number is low at the moment I have had a huge colony in there. The water is crystal clear and although I have had a few mossies there haven't been enough to worry us. It gets very hot and very cold out there but the shrimp survive well. I top the water up with the water I siphon from my tanks. Adelaide gets extremes of temperature and I have noticed in the winter the shrimp are slow and easier to catch but otherwise they all seem good. If I were to setup again I would pick a deeper pond to help lessen temperature fluctuations but otherwise I'm happy with the shrimp in there. The last time I caught some out I got over 100 various size shrimp.