"the water in the fish tank should be renewed once a week" in German The water in the fish tank should be renewed once a week. Das Wasser im Aquarium sollte einmal pro Woche erneuert werden. Detailed translations for "the water in the fish tank should be renewed once a week" The water in the fish tank should be renewed once a week. The water in the fish tank should be renewed once a week. Das Wasser im Aquarium sollte einmal pro Woche erneuert werden.