I was just attempting to move my Herald’s Angelfish from the quarantine tank (just been treated with copper, new fish before quarantine) to the main tank. While he was drip acclimating in a bag, I noticed one eye was cloudy. It had not been like this in the quarantine tank. There are no signs of flukes, ich etc on the body. Is this more likely to be injury from transferring from tank to bag with a net, or is it possible for an infection to have flared up this quickly from the stress of transferring. Maybe 40 minutes had passed from being removed from the quarantine tank. I am trying to get a good picture of his eye, but I am having difficulty, so wanted to post in the meantime to get any answers I could.
ETA: The best pic I could get for now.

ETA: The best pic I could get for now.

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