This is the 18117th most frequent Korean word.
수조에
"수조에" means "in the tank" or "in the water tank."
Here, '수조에' refers to being in a water tank or aquarium, indicating location.
물고기는 큰 수조에 살고 있습니다.
The fish live in a large aquarium.
In this sentence, '수조에' refers to the action of filling the aquarium with water, indicating the target of the action.
나는 수조에 물을 채웠습니다.
I filled the aquarium with water.
Here, '수조에' specifies that the fish is located in the aquarium which is being observed.