I think i would like to keep some rice fish in the superfish pond with a heater to stop it freezing over in the winter. I still think solar could work out i just need to do research into solar cells charging batteries and the batteries running the equipment, i find the solar part just as interesting as the pond and fish. People seem to find the medaka the hardier fish, the superfish patio pond looks good, but i don't know if i need uv for a pond