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This time I will be resetting my medaka breeding facility. The benefits are that it will prevent nymphs from getting mixed in and the bacteria will be replaced, and resetting it before winter will make a difference in how long the green water lasts. If the water is left green as in the summer it tends to become dilute, but if I reset it at this time and keep it green it is less likely to become dilute, so I will do it on a nice day.