Hello! I am planning on buying a large pot (probably about 3 feet high and 18 inches in diameter) and seal the bottom to make a minI rice paddie. I plan to fill the pot halfway with dirt and after topping it with sand, grow rice in the pot. It will be placed somewhere with more than enough sunlight so light isn't an issue. It will be stocked with trapdoor snails and malaysian trumpet snails since they burrow and can turn the dirt. I also want to keep some freshwater clam to keep the water less green and mosquito fish to stop the mosquitoes from breeding there. The idea is that the fish/clam will provide the rice nutrient and rice will clean the water so I won't have to do water changes. I am aiming for a no tech pond. The problem is, I am keeping it in my sun room and I live in Chicago. The winter here is very bitter and I am afraid that the clams and fish will not survive winter. It is in my sun room so it probably will not freeze solid, but will be very cold. The rice will not be growing during winter since it is seasonal, so the water won't be filtered. Is there anyway to keep the inhabitants alive during the winter? Will mosquito fish/clam die in such a cold weather? What is a better alternative?