Usually if it's in one eye, it's more than likely just blunt trauma/injury. Give it a couple days and it will go away. Sometimes fish bump into rocks at night if they're startled and such.
You'll want to make completely sure that it's Pop Eye before medicating, as it'll stress the fish if it's not. Up your quality and do a small water change just to get things going.
PS: Don't medicate in your display tank. Use QT if you can.
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